I.D.

 Dictionary entry overview: What does I.D. mean? 

• I.D. (noun)
  The noun I.D. has 1 sense:

1. a card or badge used to identify the bearer

  Familiarity information: I.D. used as a noun is very rare.

 Dictionary entry details 

• I.D. (noun)

Sense 1

Meaning:

A card or badge used to identify the bearer

Classified under:

Nouns denoting communicative processes and contents

Synonyms:

I.D.; ID

Context example:

you had to show your ID in order to get in

Hypernyms ("I.D." is a kind of...):

badge (an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.))

positive identification (evidence proving that you are who you say you are; evidence establishing that you are among the group of people already known to the system; recognition by the system leads to acceptance)