Definition from Wiktionary, the free dictionary
- (auxiliary) Indicating duty or obligation.
- (auxiliary) Indicating advisability or prudence.
- (auxiliary) Indicating desirability.
- (auxiliary) Indicating likelihood or probability.
- See ought for fuller examples and usage.
- Many sources consider that ought to is the basic modal verb form. However, many examples of the use of ought without to as a basic modal auxiliary verb are to be found in common use.