Definition from Wiktionary, the free dictionary
- (pharmacy) over-the-counter
- (finance) over-the-counter
- (pathology) ornithine transcarbamylase deficiency
- (military) Officers Training Corps, a part of the British Army (see Wikipedia article).
- Overseas Telecommunications Commission, a defunct department of the Australian government (see Wikipedia article).
- (slang) off the charts
- (slang, Internet, text messaging) on the cheek