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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Not formal or ceremonious; casual: an informal gathering of friends; a relaxed, informal manner.
  2. adj. Not being in accord with prescribed regulations or forms; unofficial: an informal agreement.
  3. adj. Suited for everyday wear or use: informal clothes.
  4. adj. Being more appropriate for use in the spoken language than in the written language.

Century Dictionary and Cyclopedia

  1. Not formal; not in the regular or usual form or manner; not according to rule or custom; unceremonious; irregular: as, an informal writing; informal proceedings; an informal visit.
  2. Distracted or deranged in mind.

Wiktionary

  1. adj. Not formal or ceremonious; casual.
  2. adj. Not in accord with the usual regulations; unofficial.
  3. adj. Suited for everyday use.
  4. adj. Reflecting everyday, non-ceremonious usage.
  5. adj. Not organized; not structured or planned.

GNU Webster's 1913

  1. adj. Not in the regular, usual, or established form; not according to official, conventional, prescribed, or customary forms or rules; irregular; hence, without ceremony.
  2. adj. Deranged in mind; out of one's senses.

WordNet 3.0

  1. adj. not officially recognized or controlled
  2. adj. having or fostering a warm or friendly and informal atmosphere
  3. adj. not formal
  4. adj. used of spoken and written language

Examples

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‘informal’ has been looked up 2113 times, added to 3 lists, and has a Scrabble score of 13.