(literary) Any sustained note or movement; a song; a distinct portion of an ode or other poem; also, the pervading note, or burden, of a song, poem, oration, book, etc.; theme; motive; manner; style
(biology) A particular breed or race of animal, microbe etc.
(music) A portion of music divided off by a double bar; a complete musical period or sentence; a movement, or any rounded subdivision of a movement.