Definitions:
lesser in importance, seriousness, or significance

(of a scale) having intervals of a semitone between the second and third degrees, and (usually) the fifth and sixth, and the seventh and eighth.

(following a surname in public schools) indicating the younger of two brothers

(of a term) occurring as the subject of the conclusion of a categorical syllogism.

a person under the age of full legal responsibility

a minor key, interval, or scale.

the minor leagues in baseball or american football

a student's subsidiary subject or course

a minor term or premise.

a small drab moth which has purplish caterpillars that feed on grass.

study as or qualify in a subsidiary subject at college or university