Definition of mental deficiency in English:
noun[mass noun] dated or offensive
The condition of having a mental disability.
- Were some of the figures in black meant to be portraying dishonesty or just mental deficiency?
- If the treatment starts in the first month, most children will not have mental deficiency; 75 per cent of sick children may recover if the treatment is taken within three months, Tian said.
- Apart from comparisons of races or groups, and medical assessments of profound mental deficiency, intelligence as a personal and differential characteristic elicited little concern until the later nineteenth century.
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