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To act in response to or under the influence of a stimulus or prompting: reacted strongly to the sarcastic tone of the memorandum.
(verb-intransitive)
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To act in opposition to a former condition or act: composers who reacted against romanticism.
(verb-intransitive)
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To act reciprocally or in return.
(verb-intransitive)
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Chemistry To undergo a reaction: Methane reacts with hydroxyl to produce formaldehyde.
(verb-intransitive)
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Chemistry To cause (a substance or substances) to undergo a reaction.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.