Pronunciation: (i-nish'ul),[key] —adj., n., v.,-tialed, -tial•ing or (esp. Brit.)-tialled, -tial•ling.
—adj. 1. of, pertaining to, or occurring at the beginning; first: the initial step in a process. 2. Phonet.occurring at the beginning of a word or syllable, as the (k) sound of kite, chasm, or quay.
—n. 1. an initial letter, as of a word.
2. the first letter of a proper name.
3. a letter of extra size or an ornamental character used at the beginning of a chapter or other division of a book, manuscript, or the like.
—v.t. to mark or sign with an initial or the initials of one's name, esp. as a token of preliminary or informal approval.