initial

Of, relating to, or occurring at the beginning; first.

Designating the first letter or letters of a word.

The first letter of a proper name.

The first letter of each word of a person’s full name considered as a unit.

The first letter of a word.

A large, often highly decorated letter set at the beginning of a chapter, verse, or paragraph.

To mark or sign with initials, especially for purposes of authorization or approval.

To put one’s initial or initials to or on; sign or mark with initials: as, an initialed handkerchief; initialed paper.

In steam-engines, an abbreviation of initial pressure (which see).