a group of three related plays, novels etc

three of something

the Father, Son and Holy Ghost as one God

three of something

a group of three; (a musical composition for) a group of three singers or players

three

made up of three (parts or parties); (to cause something) to become three times as many or as much

having three of something

one of three children born at one birth

three of something

one of three copies

three of something