| O level | |
| —n | |
| 1. | a. the basic level of the General Certificate of Education, now replaced by GCSE |
| b. (as modifier): O level maths | |
| 2. | a pass in a particular subject at O level: he has eight O levels |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |