ought
Word family
Synonym discussion
Sense: noun/1
All three words describe something a person is expected to do. 'Duty' is the broadest and most common — it covers moral, legal, and role-based expectations (e.g., 'jury duty,' 'duty of care'). 'Obligation' has a stronger contractual or rule-based flavour: you can have a legal obligation to pay tax, but you feel a moral duty to help a friend. 'Responsibility' focuses on the person who is answerable for an outcome: a parent has a responsibility to raise their child. The noun 'ought' is the rarest of the group and appears almost exclusively in formal or literary writing, where it names a deeply felt inner moral demand. For example, a soldier might speak of the 'ought of honour' — a duty that goes beyond what any rule book requires.
Common collocations
Phrases
- do one's ought
- feel an ought
- the ought of [honour / conscience / duty]
Etymology
The word 'ought' comes from Old English 'āhte', the past tense of 'āgan' (to own, possess, have). In early Middle English, the past-tense form gradually took on a present-tense meaning. From the sense of 'owing' or 'being indebted' grew the idea of moral obligation — what one 'owes' to others or to a higher standard. The noun 'ought' (meaning 'duty') emerged in the 1500s as a direct nominalisation of this moral sense. The modern modal verb 'ought to' developed from the same root, originally meaning 'owed to'.