(ethics, philosophy) A proponent of effective altruism ("a philosophy and social movement that advocates the use of evidence and reasoning to determine the most effective ways to benefit others").

The psychophysical phenomenon that an intentional or willed movement is slower than an automatic or reactive one.

(psychology) The phenomenon that students who teach others learn at a better quality than students who don't teach.

(medicine, pathology) A cluster of personality changes caused by the extrapyramidal effects of the medication haloperidol, mimicking parkinsonism, hypomimia, bradykinesia, and flat affect.

(theater, literature) According to Bertold Brecht, performance in such a way that the audience is hindered from simply identifying itself with the characters in the play, and must evaluate their actions on an overt, conscious level.

Nitrogen narcosis.

(baseball) The phenomenon by which the baseball "jumps" off the bat at contact.

The phenomenon whereby sensory input, or perceptions, can be mistaken for a mental image when perceptual processes and mental imagery interfere with each other.

The tendency of larger particles to bounce higher than smaller ones on high-frequency vibrating screens. / Certain situations in which moisture can cause defects in electronics.

The posited phenomenon that any shoal member that stands out in appearance will be preferentially targeted by predators, which may explain why fish prefer to shoal with individuals that resemble themselves.