Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One who devotes much time to thought or meditation.
  • n. One who thinks or reasons in a certain way: a careful thinker.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. One who spends time thinking, contemplating or meditating
  • n. An intellectual, such as a philosopher or theologian

from the GNU version of the Collaborative International Dictionary of English

  • n. One who thinks; especially and chiefly, one who thinks in a particular manner

from The Century Dictionary and Cyclopedia

  • n. One who thinks; especially, one who has cultivated or exercised to an unusual extent the powers of thought.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an important intellectual
  • n. someone who exercises the mind (usually in an effort to reach a decision)

Etymologies

think +‎ -er (Wiktionary)

Examples

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