In
music, an accent is an emphasis placed on a particular
note, either as a result of its context or specifically indicated by an accent mark. A tonic accent is an emphasis on a note by virtue of being higher in
pitch than surrounding notes. An agogic accent is an emphasis by virtue of being longer in
duration than surrounding notes, in a way that shifts their time of onset. Dynamic accents are created when one note is louder than another.
See more at Wikipedia.org...