Or/ɔːr/ Definition 1 of 5Pro Tip 1/3Choice Clarity Use 'or' to show clear choices or options available in a situation. Do you want tea or coffee? Pro Tip 2/3Exclusive Options 'Or' often implies that only one of the options can be chosen, not both. She will study law or medicine. Pro Tip 3/3Conditional Meaning Sometimes 'or' introduces a consequence if the first option is not taken. Finish your homework, or you cannot go out.