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broaden (v.)

1726, "make broad;" 1727, "grow broad;" from broad (adj.) + -en (1). The word seems no older than this (it was cited by Johnson in one of James Thomson's "Seasons" poems); broadened also is first found in the same poet. Broadening is recorded from 1835 as a noun, 1850 as a present-participle adjective.

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Definitions of broaden from WordNet

broaden (v.)
make broader;
broaden the road
broaden (v.)
extend in scope or range or area;
broaden your horizon
Synonyms: widen / extend
broaden (v.)
vary in order to spread risk or to expand;
Synonyms: diversify / branch out
broaden (v.)
become broader;
The road broadened
From wordnet.princeton.edu