initial
adjective
°Chronologically first, early; of or pertaining to the beginning, cause or origin.
"Our initial'' admiration for their efficiency gave way to disgust about their methods"
°Spatially first, placed at the beginning, in the first position; especially said of the first letter of a word.
noun
°The first letter of a word or a name.
°In plural, the first letter of each word of a person's full name considered as a unit.
verb
°To sign one's initial(s), as an abbreviated signature.
synonyms: incipient, opening, drop cap, versal