GNU Collaborative International Dictionary of English

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Found one definition

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