(US, archaic, informal, humorous) Characteristic of a freshman.

(US, Canada, Philippines) A person (of either sex) entering the first year of an institution, especially a high school (ninth grade for US and Canada, grade 7 for Philippines), a university, or legislative body.

(colloquial, US, Canada) The amount of body weight (thought to be 15 pounds) gained by a student during their first year of college.

(US, Canada, colloquial) Alternative form of freshman fifteen

(informal) The plantaris muscle.