As a Noun: 1. The condition of a man's penis when he is sexually excited and his penis is stiff, swollen, and sticking up. English = erection. As a Verb or Adjective: 1. Of a penis, to become stiff, swollen, and sticking up. English = become erect. 2. Of a man, to become sexually excited so that his penis becomes erect. English = get an erection.