An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1a) Of or pertaining to something that can exist independent of thought or perception as part of reality. Opposite of → subjective.
1b) Free of any bias or prejudice caused by personal feelings.
2) The → lens or combination of lenses nearest the → object in an optical instrument ( → telescope, → microscope, → camera).
3) The → primary mirror of a → reflecting telescope.
4) Grammar: Relating to nouns, noun phrases, or pronouns that are the objects of verbs or prepositions.

Adjective of → object.

A diffraction grating placed over the aperture of a telescope in order to produce spectra of all the objects in the field of view.

→ objective; → grating.

The lens or system of lenses in a → telescope or → microscope that magnify an object and project a larger → image. The object lens is nearest the object being viewed

→ objective; → lens.

A dispersing prism placed in front of a telescope objective to produce spectra of all luminous objects in the field of view.

→ objective; → prism.

A probability determined by the long-term frequency of an event; in contrast to subjective probability.

→ objective; → probability.