once more

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1. One time only: once a day.
2. At one time in the past; formerly.
3. At any time; ever: Once known, his face is never forgotten.
4. By one degree of relationship: my first cousin once removed.
A single occurrence; one time: Once will have to do. You can go just this once.
As soon as; if ever; when: Once he goes, we can clean up.
Having been formerly; former: the once capital of the nation.
at once
1. All at one time; simultaneously: Everything happened at once. The view of the skyline is at once awesome, grand, and disappointing.
2. Immediately; instantly: Leave the room at once.
once more/again
1. Another time; again: Could you repeat yourself once more?
2. As usual; in typical fashion: Once more, you've proven yourself inept at chess.

[Middle English ones, from on, one, from Old English ān; see oi-no- in Indo-European roots.]
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:
Adv.1.once more - anewonce more - anew; "she tried again"; "they rehearsed the scene again"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
I supported my poor girl to the chair, and once more I knelt before her and took her hands in mine.
As for me, I returned as I had come after (say) five minutes' absence; my head full once more of Eva, and of impatient anxiety for the wild young squire's final flight; and my heart still singing with the joy of which my beloved's kindness seemed a sufficient warranty.
Aristotle was again vitalized, and Plato's noble idealistic philosophy was once more appreciatively studied and understood.