(logic) A relation between two structures which have the property that every first-order formula is valid in one structure if and only if it is valid in the other.

(mathematics) Obtained by operating on one element (of a matrix etc) at a time

A student who goes to an elementary school.

plural of elementary equivalence

plural of elementary charge

plural of elementary schooler

Relating to elementology.

An approach to medicine based on the ancient elements of air, earth, fire, and water.

plural of elementary

(mathematics, education) An informally defined area of algebra considered suitable to be taught to secondary school students.