Word Study
i.d.
WORDNET DICTIONARY
Noun i.d. has 1 sense
- i.d.(n = noun.communication) id - a card or badge used to identify the bearer; "you had to show your ID in order to get in" is a kind of badge, positive identification
CIDE DICTIONARY
i.d., n. [shortened form of identification.].
any document testifying to teh identity of the bearer, especially a card or badge. [WordNet 1.5]
For further exploring for "i.d." in Webster Dictionary Online