plural of effective

plural of effectivity

(uncountable) The ability or power to be effective. / (countable) A measure of the effectiveness of something.

plural of effect

Third-person singular simple present indicative form of effect

plural of effectiveness

How well something works or gets the wanted result.

The hypothesized phenomenon that the future life expectancy of certain nonperishable things (such as a technology or an idea) is proportional to their current age, so that every additional period of survival implies a longer remaining life expectancy.

The production of electrical potential in a substance as the pressure on it changes.

(economics) The higher growth rate of businesses with higher market share in those segments of economy in which the value of a product or service depends on the compounding effects of the number of existing users of the product or a service, as is the case with telephone networks.