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1 adjective
Related topics: Grammar
1 if an offer, agreement etc is conditional, it will only be done if something else happens first [≠ unconditional]:
a conditional acceptance
conditional on/upon
His agreement to buy our house was conditional on our leaving all the furniture in it.
2SLG in grammar, a conditional sentence is one that begins with 'if' or 'unless' and expresses something that must be true or happen before something else can be true or happen
conditionally adverb

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