Suffix
Used to form an uncountable noun from an adjective; especially, to form the noun referring to the state, property, or quality of conforming to the adjective's description.
absurd + -ity → absurdity (“the quality of being absurd or inconsistent with obvious truth, reason, or sound judgment”)
anonym(ous) + -ity → anonymity (“the quality or state of being anonymous”)
modern + -ity → modernity (“the quality of being modern or contemporary”)
precar(ious) + -ity → precarity (“a condition of existence without predictability or security, affecting material or psychological welfare”)
Used to form a countable noun from an adjective, referring to someone or something that conforms to the adjective's description.
absurd + -ity → [an] absurdity (“that which is absurd; an absurd action; a logical contradiction”)
anonym(ous) + -ity → [an] anonymity (“that which is anonymous”)
insipid + -ity → [an] insipidity (“something that is insipid; an insipid utterance, sight, object, etc.”)
oddity + -ity → [an] oddity (“an odd or strange thing or opinion; a strange person; an oddball”)
Used to form other nouns, especially abstract nouns.
-ity
Alternative form of -ety
hip + -ity → hippity, hippity-hop