Existing only in the mind; conceptual, imaginary.
Not actually present, but considered as present when limits at infinity are included.
Optimal; being the best possibility.
Pertaining to ideas, or to a given idea.
Perfect, flawless, having no defects.
Teaching or relating to the doctrine of idealism.
A subsemigroup with the property that if any semigroup element outside of it is added to any one of its members, the result must lie outside of it.
A subring closed under multiplication by its containing ring.
A non-empty lower set (of a partially ordered set) which is closed under binary suprema (a.k.a. joins).
A collection of sets, considered small or negligible, such that every subset of each member and the union of any two members are also members of the collection.
A perfect standard of beauty, intellect etc., or a standard of excellence to aim at.
A Lie subalgebra (subspace that is closed under the Lie bracket) 𝖍 of a given Lie algebra 𝖌 such that the Lie bracket [𝖌,𝖍] is a subset of 𝖍.
Existing in the nature of a person or thing; innate, not acquired or learned.
Pertaining to death brought about by disease or old age, rather than by violence, accident etc.
Normally associated with a particular person or thing; inherently related to the nature of a thing or creature.
Closed under submodules, direct sums, and injective hulls.
Related genetically but not legally to one's father; born out of wedlock, illegitimate.
Having a given status (especially of authority) by virtue of birth.
Pertaining to a dice roll before bonuses or penalties have been applied to the result.
Containing no artificial or man-made additives; especially (of food) containing no colourings, flavourings or preservatives.
Neither sharp nor flat. Denoted ♮.
Pertaining to a decoration that preserves or enhances the appearance of the original material; not stained or artificially coloured.
Having an innate ability to fill a given role or profession, or display a specified character.
Related by birth; genetically related.
Designating a standard trigonometric function of an angle, as opposed to the logarithmic function.
Pertaining to a fabric still in its undyed state, or to the colour of undyed fabric.
Bidding in an intuitive way that reflects one's actual hand.
Not having used anabolic steroids or other performance-enhancing drugs.
As expected; reasonable, normal; naturally arising from the given circumstances.
Formed by nature; not manufactured or created by artificial processes.
A breast which has not been modified.
Someone who has not used anabolic steroids or other performance-enhancing drugs.
One's life.
One with an innate talent at or for something.
A roll of two dice with a score of 7 or 11 on the comeout roll.
A note that is not or is no longer to be modified by an accidental.
The symbol ♮ used to indicate such a natural note.
An almost white colour, with tints of grey, yellow or brown; originally that of natural fabric.
A hairstyle for people with Afro-textured hair in which the hair is not straightened or otherwise treated.
Naturally; in a natural manner.