DESCRIPTION:
Dictionary
goodbye |ˌgoŏdˈbī| (also good-bye or goodby or good-by) exclamation used to express good wishes when parting or at the end of a conversation. noun ( pl. -byes or -bys) an instance of saying "goodbye"; a parting : a final goodbye. ORIGIN late 16th cent.: contraction of God be with you!, with good substituted on the pattern of phrases such as good morning.

Thesaurus
goodbye exclamation Goodbye! See you all next year! farewell, adieu, au revoir, ciao, adios; bye, bye-bye, so long, see you later, see you, sayonara; bon voyage; cheers; informal toodle-oo. antonym hello. noun (oftengoodbyes) : we said our goodbyes at the door parting, leave-taking, send-off.