Capacity or power to produce a desired effect:
— Concern about the safety and efficacy of the vaccine.
synonym: efficaciousness.
Roget 157:
power;
potency,
potentiality;
jiva†;
puissance,
might,
force,
energy
etc.
171;
dint;
right hand,
right arm;
ascendency†,
sway,
control;
prepotency,
prepollence†;
almightiness,
omnipotence;
authority
etc.
737;
strength
etc.
159.
ability;
ableness
etc.
adj.†;
competency;
efficacy;
efficiency,
productivity,
expertise
(skill)
698;
validity,
cogency;
enablement†;
vantage ground;
influence
etc.
175.
pressure;
conductivity;
elasticity;
gravity,
electricity,
magnetism,
galvanism,
voltaic electricity,
voltaism,
electromagnetism;
atomic power,
nuclear power,
thermonuclear power;
fuel cell;
hydraulic power,
water power,
hydroelectric power;
solar power,
solar energy,
solar panels;
tidal power;
wind power;
attraction;
vis inertiae [Lat.],
vis mortua [Lat.],
vis viva [Lat.];
potential energy,
dynamic energy;
dynamic friction,
dynamic suction;
live circuit,
live rail,
live wire.
capability,
capacity;
quid valeant humeri quid ferre recusent [Lat.];
faculty,
quality,
attribute,
endowment,
virtue,
gift,
property,
qualification,
susceptibility.
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Roget 644:
utility;
usefulness
etc.
adj.;
efficacy,
efficiency,
adequacy;
service,
use,
stead,
avail;
help
etc.
(aid)
707;
applicability
etc.
adj.;
subservience
etc.
(instrumentality)
631;
function
etc.
(business)
625;
value;
worth
etc.
(goodness)
648;
money's worth;
productiveness
etc.
168;
cui bono [Lat.]
etc.
(intention)
620;
utilization
etc.
(use)
677;
step in the right direction.
common weal;
commonwealth public good,
public interest;
utilitarianism
etc.
(philanthropy)
910.
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Dutch: werkzaamheid, doeltreffendheid, effectiviteit
Polish: skuteczność