Princeton's WordNet

1. broaden(verb)

   make broader

   "broaden the road"

2. widen, broaden, extend(verb)

   extend in scope or range or area

   "The law was extended to all citizens"; "widen the range of applications"; "broaden your horizon"; "Extend your backyard"

3. diversify, branch out, broaden(verb)

   vary in order to spread risk or to expand

   "The company diversified"

4. broaden(verb)

   become broader

   "The road broadened"

Kernerman English Learner's Dictionary

1. broaden(verb)ˈbrɔd n

   ***to become or make wider

   to broaden the road; ***The lawn broadens out near the road.

2. broadenˈbrɔd n

   to include or involve more people or things

   Scientists have broadened their understanding of the disease.; ***Our knowledge has broadened.

Wiktionary

1. broaden(Verb)

   To make broad or broader.

2. broaden(Verb)

   To become broad or broader.

Webster Dictionary

1. Broaden(adj)

   to grow broad; to become broader or wider

2. Broaden(verb)

   to make broad or broader; to render more broad or comprehensive

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