effect

1. Execution; performance; realization; operation.Examples: "The new law will come into effect on the first day of next year."uncountable

2. (cinematography, computer graphics, demoscene) An illusion produced by technical means (as in "special effect")Examples: "The effect of flying was most convincing."; "The colored bands of color that strobe through much of the text and other visual elements are perhaps the most prototypical of all Amiga demoscene effects and, again, are a direct result of the hardware on which Megademo was created to run."countableuncountable

3. (sound engineering) An alteration, or device for producing an alteration, in sound after it has been produced by an instrument.Examples: "I use an echo effect here to make the sound more mysterious."; "I just bought a couple of great effects."countableuncountable

4. (sciences) A scientific phenomenon, usually named after its discoverer.Examples: "Doppler effect"countableuncountable

5. (sciences, statistics) An influence or causal association between two variables.Examples: "effect size"; "therapeutic effect"countableuncountable

6. (usually in the plural) Belongings, usually as personal effects.Examples: "The tenant shall pay for the repair of, or replace all such items of the fixtures, fittings, furniture and effects as shall be broken, lost, damaged or destroyed during that time."; "His Goods, Family, and all his Effects were also ſeiz'd every where, and his Family carried into Priſon."countableplural-normallyuncountable