From Longman Dictionary of Contemporary Englishthe Ascensionthe Ascensionin the Christian religion, when Jesus Christ left the earth and went to heaven → ascension
Examples from the Corpus
the Ascension• And he is already preparing Christmas stamps for the Ascension Islands.• Matthew doesn't mention the Ascension nor does John.• The pattern is completed by the account of the Ascension and Pentecost as proper to Sunday. 