noun
alternative plan; counterproposal
A formal term for a plan or proposal offered as an alternative to an existing one, often in business or policy contexts.
会議では、当初の案に加えて二つの代替案が提示された。
At the meeting, two alternative plans were presented in addition to the original proposal.
予算削減の代替案として、業務の効率化が提案された。
As a counterproposal to the budget cuts, streamlining of operations was suggested.
対案 specifically refers to a counterproposal made in direct opposition to another proposal, often in political or formal debate settings.
Compound of 代替 (だいたい, 'substitution; alternative') and 案 (あん, 'plan; proposal').