Consonance

The Technical Stuff:
Broadly, the repetition of consonant sounds; more specifically, the repetition of the final consonant sounds of accented syllables or important words.

Example:
T was later when the summer went
Than when the cricket came,
And yet we knew that gentle clock
Meant naught but going home.

’T was sooner when the cricket went
Than when the winter came,
Yet that pathetic pendulum
Keeps esoteric time.
(Emily Dickinson, "’T was later when the summer went")