different between validity vs effectivity

English

valid +? -ity, borrowed from Middle French validité, from Late Latin validitas.

validity (countable and uncountable, plural validities)

The state of being valid, authentic or genuine.
State of having legal force.
A quality of a measurement indicating the degree to which the measure reflects the underlying construct, that is, whether it measures what it purports to measure (see reliability).

effective +? -ity

effectivity (countable and uncountable, plural effectivities)

(uncountable) The ability or power to be effective.
(countable) A measure of the effectiveness of something.
(countable) [Technical documentation] An indication of the product, procedure, or timescale for which an item of information is applicable or effective.

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