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

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 172
unique
  یکتا   
yektâ (#)

Fr.: unique   

Existing as the only one or as the sole example.
Limited to a single outcome or result. → uniqueness theorem.

From Fr. unique, from L. unicus "single, sole," from unus, → one.

Yektâ "unique," from yek, → one, + "fold, plait, ply; piece, part" (Mid.Pers. tâg "piece, part").

uniqueness
  یکتایی   
yektâyi (#)

Fr.: unicité   

The state or condition of being → unique.

Noun from → unique.

uniqueness theorem
  فربین ِ یکتایی   
farbin-e yektâyi

Fr.: théorème d'unicité   

1) Physics: A → potential that satisfies both → Poisson's equation and the → boundary conditions pertinent to a particular field is the only possible potential.
2) Math.: If two → continuous functions φ(t) and ψ(t) have one and the same → Laplace transform F(p), then these functions are identically equal.
3) Astro.: A → black hole can only be characterized by its → mass, → electric charge, and → angular momentum. See also → no hair theorem.

uniqueness; → theorem.

unit
  یکا، یکان   
yekâ (#), yekân (#)

Fr.: unité   

A quantity or dimension adopted as a standard of measurement.
Math.: The lowest positive natural number.
The first digit to the left of the decimal point in decimal notation, representing a whole number less than ten.
An element in a ring that has a multiplicative inverse.

Back formation from → unity.

Yekâ, yekân, from yek, → one.

unit vector
  بردار ِ یکا   
bordâr-e yekâ

Fr.: vecteur unité   

A vector of length 1, also called a direction vector.

unit; → vector.

unitarity
  یکاییگی   
yekâyigi

Fr.: unitarité   

1) The condition of being → unitary.
2) → quantum unitarity.

unitary; → -ity.

unitary
  یکایی   
yekâyi

Fr.: unitaire   

1) Of or pertaining to a unit or units; having the indivisible character of a unit.
2) Math.: An → operator  U satisfying the relations: U+ U = 1, U U+ = 1, where U+ is the → adjoint .

unit + -ary.

unitary group
  گروه ِ یکایی، ~ یکانی   
goruh-e yekâyi, ~ yekâni

Fr.: groupe unitaire   

The set of n × n unitary matrices (→ unitary matrix).

unitary; → group.

unitary matrix
  ماتریس ِ یکایی، ~ یکانی   
mâtris-e yekâyi, ~ yekâni

Fr.: matrice unitaire   

A square matrix whose inverse equals its adjoint.

unitary; → matrix.

unitary operator
  آپارگر ِ یکایی   
âpârgar-e yekâyi

Fr.: opérateur unitaire   

A linear operator whose inverse is its → adjoint. In addition to → Hermitian operators, unitary operators constitute a fundamentally important class of quantum-mechanical operators.

unitary; → operator.

unitary transformation
  ترادیس ِ یکایی، ~ یکانی   
tarâdis-e yekâyi, ~ yekâni

Fr.: transformation unitaire   

A transformation whose reciprocal is equal to its Hermitian conjugate.

unitary; → transformation.

unite
  آیکیدن، هم‌یکیدن   
âyekidan, ham-yekidan

Fr.: unir   

To join, combine, or incorporate so as to form a single whole or unit.

M.E. uniten, from L. unitus, p.p. of unire "to unite," from unus, → one.

Âyekidan, from â- nuance/strengthening prefix + yek, → one, + -idan infinitive suffix; ham-yekidan, from ham- "together," → syn-, + yekidan.

united
  آیکیده، هم‌یکیده   
âyekidé, ham-yekidé

Fr.: uni   

Formed by or resulting from the union of two or more persons or things.

P.p. of → unite.

unity
  یکی   
yeki (#)

Fr.: unité   

The state or condition of being one.
Math.: One.

M.E. unite, from O.Fr., from L. unitatem "oneness, sameness, agreement," from unus, → one.

Yeki, noun from yek, → one.

univariate
  یکورتا   
yekvartâ

Fr.: univarié   

Statistics: Involving only one variable.

uni-; → variate.

univariate time series
  سری ِ زمانی ِ یکورتا   
seri-ye zamâni-ye yekvartâ

Fr.: série temporelle univariée   

A sequence of measurements of the same variable collected over time. Most often, the measurements are made at regular time intervals.

univariate; → time; → series.

universal
  ۱) هرگانی؛ گیتیک، گیتیانه؛ جهانی؛ ۲) هرگانه   
1a) hargâni; 1b) gitik, gitiyâné (#); 1c) jahâni (#); 2) hargâné

Fr.: universal   

1a) Of, pertaining to, or characteristic of all or the whole; relating to, affecting, or including everyone in a group or situation.
1b) Of or pertaining to the → Universe, all nature, or all existing things.
2) A trait, characteristic, or property, as distinguished from a particular individual or event, that can be possessed in common, as the care of a mother for her young (Dictionary.com).
See also: → Coordinated Universal Time, → universal astrolabe, → universal gas constant, → universal IMF, → universal quantifier, → Universal Time.
Related concepts: → all, → general, → omni-, → public, → total.

universe; → -al.

universal astrolabe
  اسطرلاب ِ هرگانی   
ostorlâb-e hargâni

Fr.: astrolabe universel   

An → astrolabe which could be used at any → latitude.

universal; → astrolabe.

universal gas constant
  پایای ِ هرگانی ِ گاز‌ها   
pâyâ-ye hargâni-ye gâzhâ

Fr.: constante universelle des gaz   

Same as → gas constant.

universal; → gas; → constant.

universal IMF
   IMF ِ هرگانی   
IMF-e hargâni

Fr.: IMF universelle   

Same as → canonical IMF.

universal; → initial mass function.

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