noun the first letter of a word or a name.
2. initial ·vt to put an initial to; to mark with an initial of initials.
3. initial ·adj placed at the beginning; standing at the head, as of a list or series; as, the initial letters of a name.
4. initial ·adj of or pertaining to the beginning; marking the commencement; incipient; commencing; as, the initial symptoms of a disease.