consisting of or existing in three persons, as the Godhead
Word origin
[1635–45; tri- + personal]This word is first recorded in the period 1635–45. Other words that entered Englishat around the same time include: cascade, coordinate, domesticate, focus, gradienttri- is a combining form meaning “three,” used in the formation of compound words. Otherwords that use the affix tri- include: triathlon, triglyceride, trilemma, trio, trivial