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

The act of compiling; something compiled.

→ compile; → -tion.

A fraction in which the → numerator or → denominator, or both, contain fractions. For example (3/5)/(6/7). Also called → compound fraction.

→ complex; → fraction.

A function whose → variables are → complex numbers.

→ complex; → function.

Same as → composite population.

→ complex; → population.

A stellar population consisting of more than one → simple population. Also called complex population.

→ composite; → population.

1) General: The act or manner of composing; the result or product of composing.
2) Chemistry: The proportion of the elements of which a substance is made up.
3) Mechanics: The determination of a force whose effect is the same as that of two or more given forces acting simultaneously.

Hamnehesh, from ham-, → com-, + neheš verbal noun from nehâdan "to put, place," → compose.

Same as → complex fraction.

→ compound; → fraction.

A statement formed from simple statements by the use of words such as "and," "or," "not," "implies," or their corresponding symbols.

→ compound; → proposition.

1) The ability to → comprehend something.
2) In logic, the sum of all the essential attributes which analysis can find in a concept or term. For example, the comprehension of the term man is rational animal; the → extension of the term man, is all men and women. Comprehension and extension are inversely proportional. The greater is the comprehension of a term, the less is its extension.

Verbal noun of → comprehend.

The act or process of compressing; the state of being compressed.

Verbal noun from → compress.

In thermodynamics, the quantity Z = pV_m/RT, in which P is the gas pressure, V_m the molar volume, R the gas constant, and T the temperature. The compression factor is a measure of the deviation of a real gas from an ideal gas. For an ideal gas the compression factor is equal to 1.

→ compression; → facteur.

A → longitudinal wave that compresses the → medium along the direction of → propagation, such as a → sound wave. Same as → compressional wave.

→ compression; → wave.

Of or relating to → compression.

→ compression; → -al.

An → elastic wave that travels through a → medium with the particles of the medium moving in the same direction as the wave propagation. The compressional wave is the wave that is primarily used in → seismic exploration. Also called P-wave, primary wave, pressure wave.

→ compressional; → wave.

Theoretical equation which gives the change in the photon wavelength due to the → Compton effect.

→ Compton; → equation.

In → gamma ray → spectroscopy, a technique to reduce the contribution of gamma rays generated by → Compton scattering.

→ Compton; → suppression.

The change in the → spectrum of → electromagnetic radiation due to → scattering from → electrons. When → photons and electrons coexist in the same volume of space, their → collisions can → transfer energy from photons to electrons (→ Compton effect) or from electrons to photons (→ inverse Compton effect).

Verbal noun of → Comptonize; → -tion.

Emission undergone → Comptonization.

→ Comptonize; → emission.

The action or state of forcing or being forced to do something; constraint (OxforddDctionaries.com).

M.E., from O.Fr. compulsion, from L. compulsion-, noun of action from past-participle stem of compellere, → compel.

Verbal noun from vâdâridan, vâdâr kardan, → compel.

The act, process, or method of calculating.

Verbal noun of → compute.