Definition - Repeating similar sounding consonants or consonantal patterns in either
(1) consecutive words or
(2) words that are in close succession.

Example -
The silken sibilance of the syllables in "sibilance" itself.

Etymology -
The word derives from the Latin consonare, to sound together (from com, with + sonare, sound).

Oxford English Dictionary -
Its first citation in this sense is from 1589:
"By using like cases, tenses, and other points of consonance, which they called Omoioteleton."
(Puttenham Eng. Poesie iii. xvi. (Arb.) 184)

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