potency; titer (measure of effective concentration in virology or chemical pathology, defined in terms of potency after dilution by titration); valence (perceived value in psychology); valency
effectiveness; positive effect; to serve (in some capacity)
to serve (in some capacity); to work (for)
effect (scientific phenomenon)
to vow loyalty and devotion to
to imitate; to follow the example of
efficiency; efficient; productivity; productiveness
usefulness; effectiveness; (economics) utility
benefit; effectiveness; efficiency
(desired) effect; (expected) result; effective
potency; titer (measure of effective concentration in virology or chemical pathology, defined in terms of potency after dilution by titration)
rendering (visual representation of how things will turn out)
to fail; to lose effectiveness
to show results; effective
actual effect; practical result; efficacy
effect; result; outcome; successful
render service to repay kindness
not valid; ineffective; in vain
effectiveness for a given period of time; prescription (law); aging (metallurgy)
to show an effect; to produce an effect; a conspicuous effect
effective; in effect; valid
special effect; specially good effect; especially efficacious
to take effect; to go into effect
healing efficacy; healing effect
performance; results; achievement
effectiveness of fertilizer
to have the desired effect
quick results; fast-acting
to be effective over an extended period
efficient; highly effective
period of validity; sell-by date
highly efficient; effectivity
highly effective; fruitful
expiry date (of document)
volumetric efficiency (engine technology)
within the period of validity; before the sell-by date
to no avail; achieving nothing; totally ineffective; to have no effect; to fall flat (esp. of joke or speech that is completely ignored)
butterfly effect (dynamical systems theory)
word frequency effect (psych.)
sensational effect; wild reaction
period during which one can prosecute or sue sb; within the statute of limitation
domino effect; ripple effect
direct effect of radiation
repetition priming effect
equivalent megatonnage (EMT)
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