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Serving to make ready or prepare; introductory. See Synonyms at preliminary.
(adjective)
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Relating to or engaged in study or training that serves as preparation for advanced education: a preparatory course; preparatory students.
(adjective)
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In preparation for. Used with to: thoroughly cleaned the house preparatory to our departure.
(adverb)
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.