The symbol ♯, placed after the name of a note in the key signature or before a note on the staff to indicate that the note is to be played a semitone higher.
“The pitch pipe sounded out a perfect F♯ (F sharp).”
A note that is played a semitone higher than usual; denoted by the name of the note that is followed by the symbol ♯.
verb
To raise the pitch of a note half a step making a natural note a sharp.
“That new musician must be tone deaf: he sharped half the notes of the song!”
To play tricks in bargaining; to act the sharper.
adjective
Terminating in a point or edge, especially one that can cut easily; not obtuse or rounded.
“A face with sharp features”
Intelligent.
“My nephew is a sharp lad; he can count to 100 in six languages, and he's only five years old.”