(grammar) In some languages, e.g. in Finnish, an object that indicates completed action, as opposed to partial object that indicates incomplete action.

Alternative spelling of object-oriented programming

(astronomy) a type of active galaxy with an active galactic nucleus (AGN), named after its prototype, BL Lacertae

(computing) An object in programming that provides an abstract interface to some type of persistence mechanism, providing some specific data operations without exposing details of the persistence layer.

(software) An individual database in the versioning software ClearCase.

(astronomy) Any natural object (usually a minor planet (asteroid) or a hypothetical planet) in the Solar System with all or most of its orbit outside the orbit of planet Neptune

(astronomy) A type of trans-Neptunian object (TNO) (a certain type of minor planet) that has an orbit in the Kuiper belt (between 30-50 AU) with inclinations consistent with the ecliptic.

Anything not readily explainable appearing to move through or be suspended in the air, primarily used to refer to objects that seem to be at least of small familiar aircraft size. Abbreviated UFO.

(astronomy) A small Solar System body (ie. asteroid, comet, or large meteoroid) whose orbit brings it into proximity with Earth's orbit.

(astronomy) a small, bright knot of nebular emission in a dark, interstellar cloud of gas and dust; thought to be mass ejected from a young star