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heighten (v.)

mid-15c., heightenen, transitive, "to exalt, to honor or raise to high position," from height + -en (1). Intransitive sense of "to become higher" is from 1560s. Related: Heightened; heightening.

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Definitions of heighten from WordNet

heighten (v.)
become more extreme;
The tension heightened
Synonyms: rise
heighten (v.)
make more extreme; raise in quantity, degree, or intensity;
heightened interest
heighten (v.)
increase;
heighten the tension
Synonyms: enhance / raise
heighten (v.)
increase the height of;
The athletes kept jumping over the steadily heightened bars
heighten (v.)
make (one's senses) more acute;
Synonyms: sharpen
heighten (v.)
make more intense, stronger, or more marked;
Pot smokers claim it heightens their awareness
Synonyms: intensify / compound / deepen
From wordnet.princeton.edu