particularity n.

late 14c., "pertaining to or affecting a single thing or person; pertaining to some and not to all," from Old French particuler (14c., Modern French particulier) and directly from Late Latin particularis "of a part, concerning a small part," from Latin particula "little bit or part, grain, jot," diminutive of pars (genitive partis) "a part, piece, division" (from PIE root *pere- (2) "to grant, allot"). Meaning "peculiar, singular, standing out from what is usual or ordinary" is by late 15c. Sense of "precise, fastidious, exacting, attentive to details" is by 1814.