What's the difference between semibreve and semiquaver?

Semibreve

Definition:

• (n.) A note of half the time or duration of the breve; -- now usually called a whole note. It is the longest note in general use.

Example Sentences:

Semiquaver

Definition:

• (n.) A note of half the duration of the quaver; -- now usually called a sixsteenth note.

Example Sentences: