produce an effect

See: affect
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3 : the ability to act or produce an effect <It's in your power to change things.
The term "efficacy" can be defined as the power to produce an effect.
Poised in front of the innumerable buttercups growing along the Guermantes Way, the young Marcel finds that, unable literally to devour the flowers in order "to consummate with my palate the plea sure which the sight of them never failed to give me," his pleasure "accumulates" on the flowers' golden surfaces "until it became potent enough to produce an effect of absolute, purposeless beauty.
The first eight lines produce an effect of formal unity, while the hexameter completes the thought of the stanza.
Irradiating a liquid hydrocarbon with high-frequency, high-intensity sound waves can produce an effect much like the burning of fuels, say researchers at the University of Illinois at Urbana-Champaign.
Unlike other applications for the treatment of dermal defects, the proposed Isolagen(R) treatment utilizies only the patients unique, living cells to produce an effect.
3 : ability to produce an effect <maximum strength cough syrup>
The aim is to produce an effect "analogous" to what transpired in the associated but independent space of the gallery.
This is another, strong indication that waves from a seismic event can in fact produce an effect in the ionosphere.