(1):
(a.) Placed at the beginning; standing at the head, as of a list or series; as, the initial letters of a name.
(2):
(n.) The first letter of a word or a name.
(3):
(v. t.) To put an initial to; to mark with an initial of initials.
(4):
(a.) Of or pertaining to the beginning; marking the commencement; incipient; commencing; as, the initial symptoms of a disease.