/əˈtenjʊeɪt/
with obj.(常作 be attenuated)
1- reduce the force, effect, or value of使减弱; 使减少（力量、效果或价值）：
her intolerance was attenuated by an unexpected liberalism.
那种意想不到的自由放任行为使她难以忍耐。
1.1
- reduce the amplitude of (a signal, electric current, or other oscillation)减弱, 减少（信号、电流或振动）。
1.2
- no obj.(of a signal, electric current, or other oscillation) be reduced in amplitude（信号、电流振动）减弱。
1.3
- usu. as adj. attenuated reduce the virulence of (a pathogenic organism or vaccine)减弱（病原体或疫苗的）毒性：
attenuated strains of rabies virus.
减低了毒性的狂犬病病毒菌种。
1.4
- reduce in thickness; make thin（使）变稀薄。
派生词
attenuation
noun词源
mid 16th cent.: from Latin attenuat- 'made slender'， from the verb attenuare, from ad- 'to' + tenuare 'make thin' （from tenuis 'thin'）.