Definitions
1.proper nounThe three persons of the Godhead: the Father, Son and Holy Spirit.
2.proper nounThree prestigious colleges in the US: Harvard, Yale, and Princeton.
3.proper nounCelery, bell peppers and onions, three important ingredients in Cajun cuisine.
4.proper nounThe combination of an opioid, a benzodiazepine and carisoprodol.
5.nounA triad of people or things which are considered (especially) essential.