i.d.

i.d.

abbr.

1. inner diameter

2. inside diameter

3. internal diameter

Thesaurus

Noun

1.

I.D. - a card or badge used to identify the bearer; "you had to show your ID in order to get in" ID badge - an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.); "they checked everyone's badge before letting them in" 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; "a system for positive identification can prevent the use of a single identity by several people"