A solemn promise, often invoking a divine witness, regarding one's future action or behavior.
OccultRelating to magical or supernatural beliefs, practices, or phenomena.
OfferTo present or propose something for acceptance.
OmerA biblical measure of grain, specifically a sheaf.
OmitTo leave out or exclude, either intentionally or forgetfully.
OrA conjunction used to link alternatives.
OrbitThe curved path of a celestial object around a star, planet, or moon.
OrganismA living entity that functions as an individual life form, composed of cells and capable of growth and reproduction.
OrgasmA physical and emotional sensation of intense pleasure, typically associated with sexual climax.
OrnateDecorated in a very intricate and detailed manner.
OspedaleA hospital; a place where the sick or injured are cared for.
OutA preposition and adverb indicating movement away from a place or position.
OverA preposition indicating a position above or higher than something else.
OverseeTo supervise or watch over the execution or performance of something.
OvershadowTo cast a shadow over; to dominate or obscure.
OvertOpen and observable; not hidden or secret.
OverviewA general review or summary of a subject.
OverviewA general summary or survey of a subject.
OverwhelmTo overpower or engulf completely.
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