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

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.

(uncountable) The process of preparing something to begin. / (countable) An act of preparing something to begin. / (programming) An assignment of an initial value for a data object or variable

plural of initialism

plural of initial

An abbreviation of a person's name, constructed by taking the initial letters of first, last, and sometimes middle name(s). See monogram

Third-person singular simple present indicative form of initial