noun
[ pl. ] mental problems that people may have from birth, or that may be caused by illness or injury, that affect their ability to learn things
noun
[ pl. ] mental problems that people may have from birth, or that may be caused by illness or injury, that affect their ability to learn things
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005