What is the meaning of Initial?

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, especially of a person's full name (their initials).

A distinguished initial letter of a chapter or section of a document.

onset, part of a syllable that precedes the syllable nucleus in phonetics and phonology.

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

initial

initial, incipient

an initial

an initial

Source: wiktionary.org