Mensuration is the process of measuring.

He is shopping for menswear.

Her mental age is higher than her actual age.

He was labeled as a mental defective.

He was diagnosed with mental deficiency at a young age.

He was admitted to a mental hospital for treatment.

She has been struggling with mental illness for years.

The mental patient was receiving treatment at the hospital.

He had a mental reservation about accepting the job offer.

People with mental retardation may require additional support to live independently.