(topology) (said to be "of" a given subset of a topological space) a point whose every neighborhood contains uncountably many points belonging to the given subset

A person on a bus who collects fares and issues tickets

(mathematical analysis) A property which can be said to be held by some point in the domain of a real-valued function if there exists a neighborhood of that point and a certain constant such that for any other point in that neighborhood, the absolute value of the difference of their function values is less than the product of the constant and the absolute value of the difference between the two points.

(mathematics) Any of a set of constraints that limit the solutions of a differential equation

person specializing in condensed matter physics

(chemistry) Synonym of Darzens reaction

(organic chemistry) A carbon–carbon bond-forming reaction that occurs between two esters or one ester and another carbonyl compound in the presence of a strong base, resulting in a β-keto ester or a β-diketone.

(physics) Any of the three necessary conditions that a baryon-generating interaction must satisfy to produce matter and antimatter at different rates: (i) baryon number violation; (ii) C-symmetry and CP-symmetry violation; (iii) interactions out of thermal equilibrium.

(archaic) compressed air

To specify; to mention.