Real Dictionary

-id in American English
a thing belonging to or connected with

-id in American English 1
suffix: 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 n

-id in American English 2
suffix: 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

-id in American English 3
suffix

-id in American English 4
suffix: a suffix occurring in descriptive adjectives borrowed from Latin, often corresponding to nouns ending in -or

-id in British English 1
suffix forming nouns: indicating the names of meteor showers that appear to radiate from a specified constellation

-id in British English 2
indicating members of a zoological family

-id in British English 3
suffix forming nouns

I.D. in American English
abbreviation: identification

I'd
I'd is the usual spoken form of 'I had', especially when 'had' is an auxiliary verb.

I'd in American English
I had
contraction of: I would or I had

I'd in British English
contraction of: I had or I would

ID
variable noun: If you have ID or an ID, you are carrying a document such as an identity card or driving licence which proves that you are a particular person.

Id in American English
that part of the psyche which is regarded as the reservoir of the instinctual drives and the source of psychic energy: it is dominated by the pleasure principle and irrational wishing, and its impulses are controlled through the development of the ego and
abbreviation: Idaho

ID in American English 1
identification
of or for identification
noun: a means of identification, as a card or bracelet containing official or approved identification information
noun: 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
transitive verb: to identify

ID in American English 2
Idaho
abbreviation: Idaho (approved esp. for use with zip code)
abbreviation: idem

ID in American English 3
symbol: dinar; dinars

ID in British English
abbreviation for: Idaho

id in British English 1
noun: the mass of primitive instincts and energies in the unconscious mind that, modified by the ego and the superego, underlies all psychic activity

id in British English 2
the internet domain name for: Indonesia

id. in American English
the same

id. in British English
abbreviation for: Idaho
abbreviation for: idem