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.

(programming) A programming paradigm that uses "objects" to design applications and computer programs.

(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

(Internet) A cross-platform, language-independent convention for representing and interacting with objects in HTML, XHTML and XML documents.

(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.

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

plural of unidentified flying object

A proposed alternative to a black hole whose collapse continually slows down, and that does not form an event horizon

plural of eternally collapsing object