(astronomy) The moment when the sun appears to cross the celestial equator while tilting away from the observer, taking place in September in the northern hemisphere and March in the southern hemisphere.

(health insurance) A process that attempts to overcome differences in insurers’ costs due to differing levels of health among members of competing insurance companies.

(mathematics) A polynomial equation of the first degree (such as x = 2y - 7)

Non-Oxford British English standard form of equalize.

(transitive) To make equal; to cause to correspond in amount or degree. / (obsolete, transitive) To be equal to; to equal, to rival.

(mathematics) A polynomial equation whose greatest exponent is 3.

(military) A line drawn on a map or chart connecting all points at which the magnetic inclination (dip) is zero for a specified epoch.

(number theory) A polynomial equation whose variables are only permitted to assume integer values.

(economics) The price of a commodity at which the quantity that buyers wish to buy equals the quantity that sellers wish to sell.

(astronomy) A great circle on the celestial sphere, coincident with the plane of earth's equator.