Abbreviation of environmental quality standard.

(mathematics, informal) A differential equation. / (mathematics, informal) A college course in differential equations, usually as part of a standardized calculus curriculum.

(law) Abbreviation of Equatorial Guinea.

plural of diff EQ

Country in Western Africa. Official name: Republic of Equatorial Guinea.

One of the two occasions in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun (the ecliptic) intersects with the equatorial plane of the Earth; this happens on a day between March 19 and 21 (spring in the Northern Hemisphere, and autumn in the Southern Hemisphere), and on another day between September 21 and 24 (autumn in the Northern Hemisphere, and spring in the Southern Hemisphere); hence, the exact time when the intersection occurs.

Occupying a position midway between two ends or sides.

The state of being calm, stable and composed, especially under stress.

A person from Equatorial Guinea or of Equatorial Guinean descent.

Of, from, or pertaining to Equatorial Guinea, the Equatorial Guinean people or the Equatorial Guinean culture.