Alternative form of if there's grass on the pitch, play ball

(mathematics) Any of the several axioms that an object should meet to be considered a mathematical field.

(definite, mathematics) the requirements for an object to be considered a field: / plural of field axiom

(algebraic number theory) A number field that is an extension field of degree two over the rational numbers.

(number theory, algebraic number theory) A number field obtained by adjoining a primitive root of unity to the field of rational numbers.

(algebra, field theory) A field L which contains a subfield K, called the base field, from which it is generated by adjoining extra elements.

plural of fieldboot

A kind of riding boot with lacing at the vamp, traditionally worn by officers ranked "field grade" or higher.

(mathematics, algebraic number theory) A field which includes the rational numbers and has finite dimension as a vector space over the rational numbers.

(historical) As a heritable right, according to the prevailing feudal obligations.