Jubilate

Part of speech: noun (n.)

1. The third Sunday after Easter; -- so called because the introit is the 66th Psalm, which, in the Latin version, begins with the words, "Jubilate Deo."

2. A name of the 100th Psalm; -- so called from its opening word in the Latin version.

Part of speech: verb (v.)

To exult; to rejoice. [R.] De Quincey.