goodbye

Etymology

From earlier goodby, Godby, Godby'e, Godbwye, God b'w'y, God bwy yee, God buy you, God be wi' you, each a progressively shorter contraction of "God be with ye" or "God be with you". Note the change of God to good by confusion with good morning, good day, etc.

intj

1. Farewell; a formula used to another person or persons when the speaker, writer, or person addressed is departing.
   Goodbye! - Goodbye, Anna. Audio (US) (file) 2016, VOA Learning English (public domain)

noun

1. An utterance of goodbye, the wishing of farewell to someone.
   They made their good-byes.
   We have time for a short goodbye.

verb

1. To say goodbye; to wish somebody farewell on parting.