A perfect standard of beauty, intellect etc., or a standard of excellence to aim at.
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 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.
Not actually present, but considered as present when limits at infinity are included.
Optimal; being the best possibility.
Existing only in the mind; conceptual, imaginary.
Pertaining to ideas, or to a given idea.
Perfect, flawless, having no defects.
Teaching or relating to the doctrine of idealism.
Something or someone excellent, of high quality.
A piece of rhizome with a dormant shoot of the lily of the valley plant, used for propagation
A spot of light or an inverted V indicative of a return of radar waves reflected from an object; a blip.
The smallest price increment between two currencies in foreign exchange (forex) trading.
One of the stylised version of the Bath star worn on the shoulder of a uniform to denote rank, e.g. of a soldier or a fireman.
One of the spots or symbols on a playing card, domino, die, etc.
A spot; a speck.
One of a series of very short, electronically produced tones, used, for example, to count down the final few seconds before a given time or to indicate that a caller using a payphone needs to make further payment to continue the call.
Any of various respiratory diseases in birds, especially infectious coryza.
To get the better of; to defeat by a narrow margin
To hit with a gunshot
To peep, to chirp
To remove the pips from.
To make the initial hole during the process of hatching from an egg