ワンコイン Meanings Prenominal one-coin (i.e. able to be paid for with only one coin, esp. a 500-yen coin, sometimes a 100-yen coin); costing 500 yen; costing 100 yen Words containing ワンコイン ワンコイン弁当 (ワンコインべんとう) 500-yen bento Jinuma: Japanese Dictionary · Word lists