Definition of ideal

  1. ideal Adjective Optimal; being the best possibility.
  2. ideal Adjective Perfect, flawless, having no defects.
  3. ideal Adjective Existing only in the mind; conceptual, imaginary.
  4. ideal Adjective Not actually present, but considered as present when limits at infinity are included.
  5. ideal Noun A perfect standard of beauty, intellect etc., or a standard of excellence to aim at.
  6. ideal Noun A subset of a partially ordered set comprising an element and all elements less than it.
  7. ideal Noun A subring closed under multiplication by its containing ring.
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