mental testing is a noun meaning "any standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etc". It carries one recorded sense.
any standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etc
“the test was standardized on a large sample of students”
Definitions, synonyms and semantic relations for mental testing come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.