Why is the ninth month called September?
early 15c., from Latin fragmentum "a fragment, remnant," literally "a piece broken off," from root of frangere "to break" (see fraction).
by 1788 (implied in fragmented), from fragment (n.). Related: Fragmenting.
fragment frag·ment (frāg'mənt)n.
A small part broken off or detached.
An incomplete or isolated portion; a bit.