The meaning of COMMONLY is as a general thing : often in the usual course of events : usually, ordinarily.

(Definition of commonly from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Collins Concise English Dictionary © HarperCollins Publishers:: commonly /ˈkɒmənlɪ/ adv usually; ordinarily: digitalis is commonly known as foxglove derogatory in a coarse or vulgar way: they dress …

1. usually; ordinarily: he was commonly known as Joe. 2. derogatory in a coarse or vulgar way: she dresses commonly.

2 meanings: 1. usually; ordinarily 2. derogatory in a coarse or vulgar way.... Click for more definitions.

There are eight meanings listed in OED's entry for the adverb commonly, three of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

COMMONLY definition: often; frequently. See examples of commonly used in a sentence.