Definition of Ought

Babylon English Dictionary
need to, must; be obligated
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Ought Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)

of Owe
  
(n. & adv.)
See Aught.
  
(imp., p. p., or auxiliary)
Was or were under obligation to pay; owed.
  
(imp., p. p., or auxiliary)
To be necessary, fit, becoming, or expedient; to behoove; -- in this sense formerly sometimes used impersonally or without a subject expressed.
  
(imp., p. p., or auxiliary)
To be bound in duty or by moral obligation.
  
(imp., p. p., or auxiliary)
Owned; possessed.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

ought
\ought\ (&add;t), n. & adv. see aught.
ought
\ought\, imp., p. p., or auxiliary. [orig. the preterit of the verb to owe. oe. oughte, aughte, ahte, as. āhte. ?110. see owe.]
1. was or were under obligation to pay; owed. [obs.] this due obedience which they ought to the king. the love and duty i long have ought you. [he] said you ought him a thousand pound.
2. owned; possessed. [obs.] the knight the which that castle ought.
3. to be bound in duty or by moral obligation. we then that are strong ought to bear the infirmities of the weak. xv. 1.
4. to be necessary, fit, becoming, or expedient; to behoove; -- in this sense formerly sometimes used impersonally or without a subject expressed. "well ought us work." to speak of this as it ought, would ask a volume. ought not christ to have suffered these things? xiv. 26.
note: ought is now chiefly employed as an auxiliary verb, expressing fitness, expediency, propriety, moral obligation, or the like, in the action or state indicated by the principal verb.

for Vocabulary Exams of KPDS, YDS,UDS (in Turkey); and SAT in America
To be under moral obligation to be or do.
Concise English-Irish Dictionary v. 1.1
ba chóir dom é a dhéanamh
English Phonetics

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JM Welsh <=> English Dictionary
Dylwn = I ought, I should
Ought Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
There are several names for the number 0 in English, and concomitant names for the decades where the tens column contains the number 0. Several names for the number 0 include "zero", "cipher", "naught", "nought", "love", "duck", "nil", "zilch", "zip", (the letter) "o" (often spelled as the exclamation "oh"), "aught", and "ought". There are various subtleties of usage amongst them all.

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