general intelligence
a general intelligence factor that, according to Spearman and others, underlies specific mental abilities and is therefore measured by every task on an intelligence test
down syndrome
condition of retardation and associated physical disorders caused by an extra copy of chromosome 21
mental retardation
aka intellectual disability, a condition of limited mental ability, indicated by an intelligence score of 70 or below and difficulty in adapting to the demands of life; varies from mild to profound