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

  • n. An acquired behavior or trait that is so long practiced as to seem innate.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A mindset, skill, or type of behavior so ingrained through habit or practice that it seems natural, automatic, or without a basis in conscious thought.

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

  • n. acquired behavior that is practiced so long it seems innate


From the proverb Habit is second nature.
(American Heritage® Dictionary of the English Language, Fourth Edition)


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