Trinity

UK: 'trinity': /ˈtrɪnɪtɪ/; 'Trinity': /ˈtrɪnəti/

US: /ˈtrɪnɪti/

US: (trin′i tē)

WordReference Random House Learner's Dictionary of American English © 2025

Trin•i•ty /ˈtrɪnɪti/   n., pl. -ties for 4 in Unabridged dictionary.

1. Religion [proper noun* usually: the + ~] in Christian doctrine, the union of three persons (Father, Son, and Holy Ghost) in one Godhead.
2. [countable* trinity] a group of three;
   triad.

WordReference Random House Unabridged Dictionary of American English © 2025

Trin•i•ty  (trin′i tē), n., pl. -ties for 2, 4.

1. Religion Also called Blessed Trinity, Holy Trinity. the union of three persons (Father, Son, and Holy Ghost) in one Godhead, or the threefold personality of the one Divine Being.
2. Fine Art a representation of this in art.
3. Religion See Trinity Sunday. 
4. (l.c.) a group of three;
   triad.
5. (l.c.) the state of being threefold or triple.

• Late Latin trīnitās triad, trio, the Trinity, equivalent. to trīn(us) threefold (see trine) + -itās -ity
• Old French
• Middle English Trinite 1175–1225

Collins Concise English Dictionary © HarperCollins Publishers::

Trinity / ˈtrɪnɪtɪ/ noun

1. Also called: Holy Trinity, Blessed Trinity the union of three persons, the Father, Son, and Holy Spirit, in one Godhead
2. See Trinity Sunday

Collins Concise English Dictionary © HarperCollins Publishers::

trinity / ˈtrɪnɪtɪ/ noun ( -ties)

1. a group of three
2. the state of being threefold

Etymology: 13th Century: from Old French trinite, from Late Latin trīnitās, from Latin trīnus triple