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To come, appear, or lie between two things: You can't see the lake from there because the house intervenes.
(verb-intransitive)
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To come or occur between two periods or points of time: A year intervened between the two dynasties.
(verb-intransitive)
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To occur as an extraneous or unplanned circumstance: He would have his degree by now if his laziness hadn't intervened.
(verb-intransitive)
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To involve oneself in a situation so as to alter or hinder an action or development: "Every gardener faces choices about how and how much to intervene in nature's processes” ( Dora Galitzki).
(verb-intransitive)
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To interfere, usually through force or threat of force, in the affairs of another nation.
(verb-intransitive)
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.