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In, to, through, or during every part of; all through: The road is kept open throughout the year.
(preposition)
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In or through all parts; everywhere: The material is flawed throughout.
(adverb)
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During the entire time or extent: Though unsure how her speech would be received, she remained calm and professional throughout.
(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.