Used other than figuratively or idiomatically: see add, fuel, fire. / (idiomatic) To worsen a conflict between people; to inflame an already tense situation.

(computing) Any of various network or communications controllers that plug into a USB port of a personal computer.

An iterative method of decision-making in the face of uncertainty that reduces uncertainty by continuous monitoring; used especially in the management of ecosystems etc.

(astronomy, optics) An optical system in telescopes that reduces atmospheric distortion by dynamically measuring and correcting wavefront aberrations in real time, often by using a deformable mirror.

A form of control system whose parameters may be changed dynamically in order to adapt to a changing environment.

(humorous, often attributive) A phrase, often satirical, recasting the Biblical couple of Adam and Eve as a homosexual couple, Adam and Steve. In context, it may be used as a pejorative against either homosexuality or religious opposition to it.

(transitive) To incorporate (something extra, often an amount of money) into something else (often a bill). / (intransitive) To put an expansion onto a building, usually a home.

Alternative form of add-on

A piece of laboratory apparatus used to connect equipment having ground glass joints of different sizes

plural of add-on