Able to be accompanied; suitable for being traveled with or joined by another person or thing.
From accompany (from Old French acompagnier: a- 'to' + compagnie 'company/fellowship') + -able suffix meaning 'capable of being.'
This word is rare, which is interesting because we use accompany all the time, but we hardly ever talk about whether something CAN be accompanied—though musicians constantly think about which songs are accompanable.
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