# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 166
 uniqueness theorem   فربین ِ یکتایی   farbin-e yektâyiFr.: 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 yekâFr.: vecteur unité   A vector of length 1, also called a direction vector.→ unit; → vector. unitary   یکایی، یکانی   yekâyi, yekâniFr.: unitaire   Of or pertaining to a unit or units; having the indivisible character of a unit. Math.: An operator U satisfying the relations: U+ U = 1, U U+ = 1, where U+ is the adjoint.From → unit + -ary.Yekâyi, yekâni, from yekâ, yekân, → unit. unitary group   گروه ِ یکایی، ~ یکانی   goruh-e yekâyi, ~ yekâniFr.: groupe unitaire   The set of n × n unitary matrices (→ unitary matrix).→ unitary; → group. unitary matrix   ماتریس ِ یکایی، ~ یکانی   mâtris-e yekâyi, ~ yekâniFr.: matrice unitaire   A square matrix whose inverse equals its adjoint.→ unitary; → matrix. unitary transformation   ترادیس ِ یکایی، ~ یکانی   tarâdis-e yekâyi, ~ yekâniFr.: transformation unitaire   A transformation whose reciprocal is equal to its Hermitian conjugate. unite   آیکیدن، هم‌یکیدن   âyekidan, ham-yekidanFr.: 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-yekidéFr.: 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   yekvartâFr.: univarié   Statistics: Involving only one variable.→ uni-; → variate. univariate time series   سری ِ زمانی ِ یکورتا   seri-ye zamâni-ye yekvartâFr.: 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) hargânéFr.: 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 hargâniFr.: astrolabe universel   An → astrolabe which could be used at any → latitude.→ universal; → astrolabe. universal gas constant   پایای ِ هرگانی ِ گاز‌ها   pâyâ-ye hargâni-ye gâzhâFr.: constante universelle des gaz   Same as → gas constant.→ universal; → gas; → constant. universal IMF    IMF ِ هرگانی   IMF-e hargâniFr.: IMF universelle   Same as → canonical IMF. universal quantifier   چندیگر ِ هروین   candigar-e harvinFr.: quantificateur universel   A symbol of → predicate logic which expresses that the statements within its scope are → true for everything, or every instance of a specific thing. The symbol ∀ "for all" is used as the universal quantifier. Universal quantifiers are normally used in logic in conjunction with predicate symbols, which say something about a variable or constant, in this case the variable being quantified.→ universal; → quantifier. Universal Time (UT)   زمان ِ جهانی   zamân-e jahâniFr.: temps universel   A measure of time that conforms, within a close approximation, to the mean diurnal motion of the Sun and serves as the basis off all civil timekeeping. The local civil time for a position on the Greenwich meridian.→ universal; → time. Universal Time Coordinated   زمان ِ جهانی ِ همرایانیده   zamân-e jahâni-ye hamrâyânidéFr.: temps universel coordonné   Sale as → Coordinated Universal Time (UTC). universality   هرگانیگی   hargânigiFr.: universalité   The character or state of being universal.→ universal; → -ity.