Similar words: occasion, occasional, on occasion, occasionally, evasion, invasion, pervasion, abrasion. Meaning: [ə'keɪʒn] 
n. something you have to do.
n. something you have to do. 151 In the heart of the Anatolian steppe, dervishes still whirl on festive occasions in mystic union with God.
More similar words: occasion, occasional, on occasion, occasionally, evasion, invasion, pervasion, abrasion, persuasion, dimensions, provisions, convulsions, casino, cast aside, occupation, occupational, preoccupation, lesion, fusion, vision, constitutional convention, session, pension, mission, elision, erosion, mansion, cession, version, tension.