Id.

Collins Concise English Dictionary © HarperCollins Publishers::

Id. abbreviation

1. Idaho

WordReference Random House Learner's Dictionary of American English © 2025

id /ɪd/   n. [countable* usually singular;
usually: the + ~]

1. Psychology the part of mind that is the source of unconscious and instinctive drives that seek satisfaction and pleasure. Compare ego (def. 2),superego.

ID /ˈaɪˈdi/  n., pl. ID's, IDs. 

1. a means of identification, as a document containing information regarding the bearer's identity:
   [uncountable] Stores need two forms of ID, a driver's license and a credit card.
   [countable] The bartender refused to accept the teenager's ID.

Also, I.D. 
ID or Id., an abbreviation of:

1. Place Names Idaho.

I'd /aɪd/  

1. Pronouns contraction of I would:
   I'd be there sooner if I could.
2. contraction of I had:
   I'd been there many times.

I.D.,  an abbreviation of:

1. identification.
2. identity.

WordReference Random House Unabridged Dictionary of American English © 2025

id  (id), n. [Psychoanal.]

1. Psychology the part of the psyche, residing in the unconscious, that is the source of instinctive impulses that seek satisfaction in accordance with the pleasure principle and are modified by the ego and the superego before they are given overt expression.

• Latin id it, as a translation of German Es, special use of es it, as a psychoanalytic term
• 1920–25

ID  (ī′dē′), 

1. a means of identification, as a card or bracelet containing official or approved identification information.

v.t. ID'd or IDed or ID'ed, ID'ing or ID•ing. 

2. to identify.
3. to issue an ID to:
   Go to the admissions office if you haven't been ID'd yet.

ID ,

1. Place Names Idaho (approved esp. for use with zip code).
2. Also, i.d. inside diameter.

I'd  (īd), 

1. Pronouns contraction of I would or
   I had.

Usage

See contraction. 

-id¹ ,

1. a suffix of nouns that have the general sense "offspring of, descendant of,'' occurring originally 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;
   Attalid), and in names of periodic meteor showers, with the base noun usually denoting the constellation or other celestial object in which the shower appears (Perseid).

• Greek: masculine patronymic suffix
• Latin -idēs
• Greek: feminine patronymic suffix; or
• Latin -id-, stem of -is

-id² ,

1. a suffix occurring in English derivatives of modern Latin taxonomic names, esp. zoological families and classes;
   such derivatives are usually nouns denoting a single member of the taxon or adjectives with the sense "pertaining to'' the taxon:
   arachnid; canid.

• Greek -idēs -id¹, as singular of Neo-Latin -ida -ida or -idae -idae

-id³ ,

1. var. of -ide:
   lipid.

-id⁴ ,

1. a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or ¹ : fetid;
   humid;
   pallid.

• Latin -idus

ID. ,

1. (in Iraq ) dinar;
   dinars.

Id. ,

1. Place Names Idaho.

id. ,

1. idem.

I.D. ,

1. identification.
2. identity.
3. Military Infantry Division.
4. Government Intelligence Department.

• 1950–55

Collins Concise English Dictionary © HarperCollins Publishers::

id. abbreviation

1. idem