(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.

In behaviorist-based instructional design processes, an expected outcome of an instructional unit. A well-constructed behavioral objective consists of three parts: conditions, behavior, and criteria.

Someone who refuses to perform military service (for example to fight in an armed conflict, or be compulsory drafted in a time of peace) because of religious or moral principles.

(programming) Using entities called objects that can process data and exchange messages with other objects.

A lesson taught (especially to young children) using a familiar or unusual object as a focus. / An example from real life that explains a principle or teaches a lesson.

(pathology) Obese to an extent that is life-threatening.

A blenny fish, Obliquichthys maryannae

The honourable obligation that is the responsibility of those of high rank; in American English this often includes the expectation of benevolent actions such as helping those less fortunate.

(neuroanatomy, anatomy) The lower portion of the brainstem.