GNU Collaborative International Dictionary of English

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  1.       

    Onerous , a. [L. onerosus, fr. onus, oneris, a load, burden: cf. F. onéreux.] Burdensome; oppressive. “Too onerous a solicitude.”  
    I. Taylor.

    1913 Webster
    Onerous cause (Scots Law), a good and legal consideration; -- opposed to gratuitous.
    1913 Webster

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