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1. Contraction of I had.
2. Contraction of I would.


contraction of
I had or I would



n. Psychoanal.
the part of the psyche that is the source of unconscious and instinctive impulses that seek satisfaction in accordance with the pleasure principle. Compare ego (def. 2), superego.
[1924; < Latin id it, as a translation of German Es literally, it]



n., pl. ID's, IDs
v., ID'd or IDed or ID'ed, ID'ing or ID•ing.
1. a means of identification, as a document containing information regarding the bearer's identity.
2. to identify.
3. to issue an ID to: Go to the admissions office if you haven't been ID'd yet.


1. Also, Id. Idaho.
2. Also, i.d. inside diameter.
3. (Iraq) dinar.


contraction of I would or I had.


a suffix of nouns that have the general sense “offspring of, descendant of,” occurring orig. in loanwords from Greek (Atreid; Nereid), and productive in English on the Greek model, esp. in names of dynasties, with the dynasty's founder as the base noun (Abbasid; Fatimid), and in names of periodic meteor showers, with the base noun usu. denoting the constellation or other celestial object in which the shower appears (Perseid).
[< Latin -id-, s. of -is < Greek]


a suffix occurring in English derivatives of modern Latin taxonomic names, esp. zoological families and classes; such derivatives are usu. nouns denoting a single member of the taxon or adjectives with the sense “pertaining to” the taxon: arachnid; canid.
[< Greek -idēs]


var. of -ide: lipid.


a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or1: humid; pallid.
[< Latin -idus]




1. identification.
2. identity.
3. Intelligence Department.