What does oblate mean?
Oblate is chiefly a formal adjective describing something that is flattened or shaped like an ellipse, especially a spheroid that is wider around its equator than at its poles. Planets such as Earth and Saturn provide familiar examples because rotation makes them slightly oblate rather than perfectly spherical. In technical writing, oblate is a useful precise alternative to the more general terms flattened or oval, particularly when describing the relationship between equatorial and polar axes. The word also has a less common religious noun meaning: a person who has offered or dedicated themselves to a religious life or service, especially in Catholic and monastic settings. In figurative language, oblate can suggest compression or a reduced height. Its Latin origin connects it with the idea of something being offered or sacrificed, while its modern scientific sense belongs to the vocabulary of geometry and astronomy.
Flattened in shape, especially of a spheroid or ellipsoid that is wider at the equator than at its poles.
"The astronomers measured the planet's oblate shape and its equatorial diameter."
A technical term in geometry, astronomy, and physics; in general figurative use, it can suggest compression or flattening.
A person, especially a layperson, who has offered or dedicated themselves to a religious life or service.
"She entered the monastery as an oblate and devoted her days to its charitable work."
Relatively uncommon outside Catholic and monastic contexts.
The plural is used when referring to multiple people who have dedicated themselves to a religious life or service.
"Several oblates from the community joined the retreat."
A planet can be round and still be oblate: Earth's rotation makes it slightly wider around the middle than at the poles.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does oblate come from?
The word comes from Latin oblatus, the past participle of offerre, “to offer,” literally “to bring before.” In religious contexts, the word developed from the idea of a person being offered or dedicated to a religious life. The English adjective also acquired a separate geometric sense meaning flattened or elliptical. Related words include oblation, an offering, and oblative, a grammatical term associated with offering; these reflect the same Latin root.
Related word forms
How oblate is actually used
The geometric sense is formal and technical, especially in astronomy, geometry, and physics; it contrasts with prolate. The noun is relatively uncommon and is chiefly associated with Catholic and monastic religious contexts. Figurative uses of the adjective usually suggest flattening, compression, or a shortened vertical dimension.
Easily confused with oblate
Oblate means flattened or elliptical, whereas oblique means slanting or not perpendicular to a reference line or plane.