transcription, транскрипция: [ ˈlet-ˌdau̇n ]
noun
Date: 1768
1.
a. : discouragement , disappointment
his latest novel is a letdown
b. : a slackening of effort : relaxation
2. : the descent of an aircraft or spacecraft to the point at which a landing approach is begun
3. : a physiological response of a lactating mammal to suckling and allied stimuli whereby previously secreted milk from the acini is expelled into ducts and drawn through the nipple