Definition of mental deficiency in English:

mental deficiency

Line breaks: men¦tal de|fi¦ciency

Entry from British & World English dictionary

noun

[mass noun] dated or offensive
The condition of having a mental disability.

Definition of mental deficiency in:

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Word of the day flagitious
Pronunciation: fləˈdʒɪʃəs
adjective
(of a person or their actions) criminal; villainous