ambiguity; polysemy
Linguistics term for a word having multiple meanings. 多義性 is the property of being polysemous, while 曖昧性 is more general ambiguity.
The polysemy of the word 'bank' is resolved by context.
Compound of 多 (many) + 義 (meaning) + 性 (property). A modern technical term formed from kanji components.