減衰

(1)a condition inferior to an earlier condition; a gradual falling off from a better state

(2)初期の条件より劣った条件

(3)先立つ状態よりも劣っていること

(4)the process of gradually becoming inferior

(5)徐々に劣っていく過程

(6)weakening in force or intensity; "attenuation in the volume of the sound"

(7)力や強度が弱まること

(8)the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation

(9)電離放射線の放出を伴う放射性物質の自発的崩壊