say it: TRIN-uh-tee
trinity is a noun meaning "the cardinal number that is the sum of one and one and one". It carries 3 recorded senses.
the union of the Father and Son and Holy Ghost in one Godhead
three people considered as a unit
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for trinity come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.