What term refers to glandular secretion in abnormal quantity?

The correct term that refers to glandular secretion in abnormal quantity is hypersecretion. This term specifically identifies a situation where a gland produces more hormones or other substances than normal. For example, in medical conditions such as hyperthyroidism, the thyroid gland secretes too much thyroid hormone, leading to various systemic effects.

Functional activity pertains to the normal operations of an organ or system, rather than the quantity of secretion. Hyposecretion, in contrast, would describe a situation where there is insufficient secretion produced by the gland. An adenoma is a type of benign tumor that arises from glandular tissue; while it may cause increased secretion depending on its nature, it does not specifically refer to the quantity of secretion itself. Therefore, hypersecretion is the most accurate term to describe an abnormal increase in glandular output.