Definitions
1.nounThe first letter of a word or a name.
2.nounIn plural, the first letter of each word of a person's full name considered as a unit."You can get your initials printed at the top."
3.nounA distinguished initial letter of a chapter or section of a document.
4.nounOnset, part of a syllable that precedes the syllable nucleus in phonetics and phonology.
5.nounAn abbreviation of a person's name, constructed by taking the initial letters of first, last, and sometimes middle name(s). See monogram"You may leave out where you live and use either initials or an alias, since gods, buddhas and other divinities look only at our hearts."