1. 何かの進歩や改良に手を貸す、または進歩や改良が簡単にできるようにする行為(act of assisting or making easier the progress or improvement of something)
2. 単独では神経の反応を引き起こすのには不十分な2つ以上の神経刺激が合わさって、活動電位を引き起させる現象(phenomenon that occurs when two or more neural impulses that alone are not enough to trigger a response in a neuron combine to trigger an action potential)
3. 簡単に(またはより簡単に)される状態(the condition of being made easy (or easier))