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

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.

The act of adding one's initials to a document rather than signing

present participle of initial

simple past tense and past participle of initial

plural of initialization

One who, or that which, initializes. / (programming) A routine that prepares something for use.

plural of initializer

Third-person singular simple present indicative form of initialize