WordNet sense 1 (a small part that can be considered separately from the whole):

detail, item

WordNet sense 2 ((logic) a proposition that asserts something about some (but not all) members of a class):

particular proposition

WordNet sense 3 (first and most important):

special

WordNet sense 4 (of first rank or importance or value; direct and immediate rather than secondhand):

primary

WordNet sense 5 (unique or specific to a person or thing or category):

peculiar

WordNet sense 6 ((sometimes followed by `to') applying to or characterized by or distinguishing something particular or special or unique):

specific

WordNet sense 7 (exacting especially about details):

finicky, fussy, picky, finical

WordNet sense 8 (giving careful attention to detail; hard to please; excessively concerned with cleanliness):

fastidious

WordNet sense 9 (surpassing what is common or usual or expected):

exceptional, especial

WordNet sense 10 (not common or ordinarily encountered; unusually great in amount or remarkable in character or kind):

uncommon

WordNet sense 11 (exercising caution or showing care or attention):

careful