retardation

US 
UK [ˌriːtɑː'deɪʃ(ə)n]
  • n.迟滞;阻碍;迟钝;迟延程度
  • Web延迟;减速;减速度
n.
1.
迟延,推迟,迟滞;阻碍;迟延程度,妨碍量;【心】发育迟缓;迟钝;【物】减速度,妨碍物

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard