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

1) Math., logic: With reference to any set A, conceived as a subset of some larger set U, all the elements of U that are not contained in A.
2) Optics: A complementary color that, when combined to another, creates neutral gray.

From O.Fr. complement, from L. complementum "that which fills up or completes," from complere "fill up," → complete.

Osporân, from ospor present tense stem of osporidan "to → complete."

The state or quality of being → complementary.

From → complementary + → -ity.

From osporandé, → complementary, + -gi, same as -i noun suffix.

Physical principle, put forward by Niels Bohr in 1928, that a complete knowledge of phenomena on atomic dimensions requires a description of both wave and particle properties.

→ complementarity; → principle.

Forming or serving as a complement; completing.

From → complement.

Any angle that when added to another one creates a 90° angle.

→ complementary; → angle.

Same as → complementary screens.

→ complementary; → aperture.

Two apertures where opaque and transparent areas are inverted. If A is an aperture that has some opaque areas and some transparent ones, the complementary pattern A' is the pattern in which exactly the opposite areas are opaque and transparent. Thus, the complimentary screen of a single slit is a wire of the same size, and the complementary screen of a circular opening is a dot. A better term would be → complementary apertures.

→ complementary; → screen.