(psychology) The finding that reactions are usually faster and more accurate when the stimulus occurs in the same relative location as the response, even if the stimulus location is irrelevant to the task.

The involuntary tendency of speakers to increase their vocal effort when speaking in the presence of noise.

(aeronautics) Any aerodynamic effects occurring due to a vehicle's body or appendages moving in close proximity to the ground.

(sciences) A side-effect, especially a negative one in pharmacology.

(computing, software) The replacement, by a spell checker, of words that it interprets as being misspelled, by words which are still incorrect in context.

A phenomenon in which attempting to suppress an item of information attracts even more unwanted attention, thus furthering its dissemination.

(Britain) A secondary, often unintended effect; a repercussion, chain reaction.

The technical notion of sensitive dependence on initial conditions in chaos theory.

The property of being cost-effective.

(physics) The energy of a heterogeneous (polychromatic) photon beam calculated as if it were monochromatic