In a manner that shows struggle, competition, or argument; done while contending or opposing something.
From 'contending' (present participle of contend) plus the -ly adverbial suffix, which transforms adjectives and verbs into adverbs that describe how an action is performed.
This rare adverb lets you describe how someone does something 'in a contentious way'—imagine describing a debate where participants are 'contendingly' expressing their opposing views with intensity and passion.
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