(linguistics) A term formed from the initial letters of several words or parts of words, which is itself pronounced letter by letter.

plural of initialism

At the beginning.

Chronologically first, early; of or pertaining to the beginning, cause or origin. / Spatially first, placed at the beginning, in the first position; especially said of the first letter of a word.

The first letter of a word or a name. / In plural, the first letter of each word of a person's full name considered as a unit.

(transitive) To sign one's initial(s), as an abbreviated signature.

simple past tense and past participle of initialize

present participle of initialize

plural of initiation

present participle of initial