Definition of "obsolete" []

• No longer in use: an obsolete word. (adjective)
• Outmoded in design, style, or construction: an obsolete locomotive. (adjective)
• Biology Vestigial or imperfectly developed, especially in comparison with other individuals or related species; not clearly marked or seen; indistinct. Used of an organ or other part of an animal or plant. (adjective)
• To cause to become obsolete. (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.

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• "What it has done and how it has done it, "published later as Tract 41 and renamed, when the passage of years rendered the title obsolete," The"
• "A term obsolete in Science if used with reference to Spirit, or Deity."