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

1) The act or process of collecting.
2) A group of objects or works to be seen, studied, or kept together.

Verbal noun from → collect.

Forming a whole; of or characteristic of a group taken together.

→ collect + → -ive.

1) The whole behavior of a system of many interacting components, which differs from that of the individual components. Some classical examples are the → many-body problem, → phase transition, most of thermodynamic phenomena, collective oscillations occurring in solids, etc. Physics dealt with collective behavior much earlier than the term collective behavior was even coined.
2) Sociology: The more or less unpredictable act of people when being in group, which is totally different from the behavior they would have if acted individually.
3) Biology: A large number of group phenomena such as pattern formation, self organization, trail formation, and synchronization seen among many living creatures.

→ collective; → behavior.

Formation of stars, especially → massive stars, in group as opposed to individual formation.

→ collective; → star; → formation.

1) The principle of ownership of the means of production, by the state or the people.
2) A social system based on this principle (Dictionary.com).

→ collective; → -ism.

1) Collective character.
2) A collective whole.

→ collective; → -ity.

The process of forming collectives or collective communities where property and resources are owned by the community and not individuals (TheFreeDictionary.com).

Verbal noun of → collectivize.

To organize (a people, industry, economy, etc.) according to the principles of → collectivism (Dictionary.com).

→ collective; → -ize.

A device that collects: a solar energy collector; a dust collector.
The semiconductor region in a bipolar junction transistor in which most of the current flows.

From → collect + -or.

1) To strike together with forceful impact, such as two astronomical objects.
2) Of two or more atomic particles, to approach closely resulting in an abrupt change of momentum or exchange of energy.

From L. collidere "to strike together," from col- variant of → com- "together" + laedere "to strike," of unknown origin.

Ham- "together, with," → com- + kubidan, kuftan "to beat, strike, pound," kus "drum," Mid.Pers. kôftan and kôstan "to beat, strike."

A particle accelerator in which two beams of particles are forced to collide head on.

Agent noun from → collide + → -or.

Same as → collider.

→ collide; → beam; → accelerator.

To pack and align photons or atomic particles parallel to a particular direction.

L. collimatus, p.p. of collimare, alteration of collineare "to make straight," from → com- + linea, → line.

From ham- "together, with," → com- + râstâ, → direction, + -idan infinitive suffix, kardan "to do," → work.

Made accurately parallel or brought into line.

Past participle of → collimate.

A → beam of → photons or → subatomic particles with a narrow → cross section that has little or no spatial spread.

→ collimated; → beam.

A beam of particles in which every particle would have exactly the same direction of travel, thereby the jet moves without → dispersion. Collimated jets of → plasma are associated with → protostars.

→ collimated; → jet.

1) The process of restricting a beam of photons or particles to a given area.
2) The process of adjusting a telescope to place all optical elements in precise alignment. → align a telescope.

Verbal noun of → collimate.

An instrument that creates a tight parallel beam of light or particles.

Agent noun from → collimate.

A catalog of → open clusters published in 1931.

Named after Per Collinder (1890-1975) the Swedish astronomer who created the catalog; → catalog.

Lying on the same straight line. Collinear points are a set of points on the same line.

→ com- + → linear.