PLACEBO EFFECT
\pləsˈiːbə͡ʊ ɪfˈɛkt], \pləsˈiːbəʊ ɪfˈɛkt], \p_l_ə_s_ˈiː_b_əʊ ɪ_f_ˈɛ_k_t]\
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any effect that seems to be a consequence of administering a placebo; the change is usually beneficial and is assumed result from the person's faith in the treatment or preconceptions about what the experimental drug was supposed to do; pharmacologists were the first to talk about placebo effects but now the idea has been generalized to many situations having nothing to do with drugs
By Princeton University