one by one

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1. Being a single entity, unit, object, or living being: I ate one peach.
2. Characterized by unity; undivided: They spoke with one voice.
a. Of the same kind or quality: two animals of one species.
b. Forming a single entity of two or more components: three chemicals combining into one solution.
4. Being a single member or element of a group, category, or kind: I'm just one player on the team.
5. Being a single thing in contrast with or relation to another or others of its kind: One day is just like the next.
6. Occurring or existing as something indefinite, as in time or position: He will come one day.
7. Occurring or existing as something particular but unspecified, as in time past: late one evening.
8. Informal Used as an intensive: That is one fine dog.
9. Being the only individual of a specified or implied kind: the one person I could marry; the one horse that can win this race.
1. The cardinal number, represented by the symbol 1, designating the first unit in a series.
2. A single person or thing; a unit: This is the one I like best. Of her many books, the best ones are the last two.
3. A one-dollar bill.
1. An indefinitely specified individual: She visited one of her cousins.
2. An unspecified individual; anyone: "The older one grows the more one likes indecency" (Virginia Woolf).
at one
In accord or unity.
one and all
one by one
Individually in succession.

[Middle English on, from Old English ān; see oi-no- in Indo-European roots.]
Usage Note: In formal usage, the pronoun one is sometimes used as a generic pronoun meaning "anyone": One would hope that train service could be improved. The informal counterpart of one is you: You never know what to expect from her. Trouble arises when one is used in a series of sentences, and there is a need for a relative pronoun to refer back to one. One option is to use one and one's repeatedly, as in One tries to be careful about where one invests one's money. But in a sequence of sentences this inevitably becomes tedious. A traditional alternative has been to use he, him, and his: One tries to be careful about his investments. This has the drawback of raising the specter of gender bias. Because of these problems, the temptation may arise to switch to you, but this will undoubtedly be distracting to the reader. It is better to use the same generic pronoun throughout. · As a generic pronoun, one should be avoided as the direct object of a verb or a preposition, especially if it comes at the end of the sentence. Thus the sentence Bad dreams can make one restless may sound stilted, but One must not tease the bears or they will attack one sounds almost ungrammatical. As a subject or in the possessive form, one fares much better. One should be cordial with one's colleagues sounds somewhat formal, but is acceptable. · Does the phrase One of x, where x is a plural noun phrase, take a singular or a plural verb? Sometimes the answer is straightforward. In the sentence One of every ten rotors was found defective, the one defective rotor is contrasted with, rather than being an example of, the larger group of rotors. A singular verb is almost always used here because it agrees with the singular "one." In 2001, 99 percent of the Usage Panel accepted the singular verb in this sentence. In many cases, the contrastive use of one of can be easily identified by the fact that the phrase containing one is introduced by the definite article: He is the only one of the students who has (not have) already taken Latin. Constructions such as one of those people who are more problematic. In the sentence He is one of those men who are constantly complaining about their jobs, the one man, rather than being in contrast to the larger group, is an example of a larger group of men who complain. The relative pronoun who appears to refer to men, and so the verb should be plural: are. But the use of a singular verb in sentences like these has long been common, even among the best writers, presumably because the relative clause, though semantically modifying the adjacent noun (men), feels like it fits equally well with the subject noun (he). The Usage Panel, accordingly, does not have a strict preference for the plural form. In our 2014 survey, although 72 percent accepted the plural are constantly complaining, 57 percent accepted the singular is constantly complaining. In some cases the Panel actually preferred the supposedly incorrect singular: 64 percent accepted The sports car turned out to be one of the most successful products that was ever manufactured in this country, while only 55 percent accepted were ever manufactured. Several Panelists commented that they decide by ear which verb form to use, and that appears to be the most viable advice. In some (but not all) cases, the sentence can be rewritten to avoid the choice: The sports car turned out to be one of the most successful products ever manufactured in this country. · Constructions using one or more or one or two always take a plural verb: One or more cars were parked in front of the house each day this week. One or two students from our department have won prizes. Note that when followed by a fraction, one ordinarily gets a plural verb: One and a half years have passed since I last saw her. The fraction rule has an exception in that amounts are sometimes treated as singular entities: One and a half cups is enough sugar. Note also that the plural rule does not apply to these one-plus-a-fraction constructions that are introduced by the indefinite article. These constructions are always singular: A year and a half has passed since I last saw her. See Usage Note at he1.
Word History: Why do we pronounce one (wŭn) and once (wŭns) while other words derived from one, like only, alone, and atone, are pronounced with a long o? Over time, stressed vowels commonly become diphthongs, as when Latin bona, the feminine singular of the adjective meaning "good," became buona in Italian and buena in Spanish. A similar diphthongization of one and once began in the late Middle Ages in the west of England and in Wales and is first recorded around 1400. The vowel sound underwent a series of changes, such that the word's pronunciation went from (ōn) to (o͞oōn), with two syllables, to (wōn) to (wo͞on) to (wo͝on) and finally to (wŭn). In southwest England, this diphthongization happened to other words beginning with the long o sound, such as oats, pronounced there now as (wŭts). Only in one and once did this diphthongal pronunciation gain widespread usage.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend: by one - in single file; "the prisoners came out one by one" by one - one piece at a time; "she sold the plates by the piece" by one - apart from others; "taken individually, the rooms were, in fact, square"; "the fine points are treated singly"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
واحِدا تِلْو الآخَر
en efter en
einn af öîrum
birer birer


(wan) noun
1. the number or figure 1. One and one is two (1 + 1 = 2).
2. the age of 1. Babies start to talk at one.
1. a single person or thing. She's the one I like the best; I'll buy the red one.
2. anyone; any person. One can see the city from here.
1. 1 in number. one person; He took one book.
2. aged 1. The baby will be one tomorrow.
3. of the same opinion etc. We are one in our love of freedom.
having one (of something). a one-legged man.
oneˈself pronoun
1. used as the object of a verb, the subject of which is one. One should wash oneself every morning.
2. used in emphasis. One always has to do these things oneself.
one-night ˈstand noun
(slang) a one-night sex partner; sexual intercourse with a one-night partner.
one-ˈoff noun, adjective
(something) made, intended etc for one occasion only. It's just a one-off arrangement.
one-parent ˈfamily noun
(also single parent family) a family with only a mother or a father to look after the children.
one-ˈsided adjective
1. with one person or side having a great advantage over the other. a one-sided contest.
2. representing only one aspect of a subject. a one-sided discussion.
one-ˈway adjective
1. in which traffic can move in one direction only. a one-way street.
2. (especially American) valid for travel in one direction only. a one-way ticket.
one-year-old noun
a person or animal that is one year old.
(of a person, animal or thing) that is one year old.
all one
just the same. It's all one to me what she does.
be one up on (a person)
to have an advantage over (someone). We brought out a book on this before our rivals so we're one up on them.
not be oneself
to look or feel ill, anxious etc. I'd better go home – I'm not myself today.
one and all
all (of a group). This was agreed by one and all.
one another
used as the object of a verb when an action takes place between people etc. They hit one another.
one by one
(of a number of people, things etc) one after the other. He examined all the vases one by one.
one or two
a few. I don't want a lot of nuts – I'll just take one or two.

one of is followed by a plural noun or pronoun, but takes a singular verb: One of the girls works as a hairdresser ; One of them is ill .
Kernerman English Multilingual Dictionary © 2006-2013 K Dictionaries Ltd.
References in classic literature ?
(And I heard nor sigh nor groan) With heavy thump, a lifeless lump, They dropped down one by one.
A Cat, discovering this, made her way into it and began to catch and eat them one by one. Fearing for their lives, the Mice kept themselves close in their holes.
The merry old gentleman had a basket of small toys with him, and he tossed the toys one by one to the children as he passed by.