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

The sudden and violent release of mechanical, chemical, or nuclear energy from a confined space which creates a heat wave that travels at → subsonic speeds. → detonation; → deflagration; → implosion.

Verbal noun of → explode.

1) (n.) A chemical or compound that causes a sudden, almost instantaneous release of pressure, gas, heat, and light when subjected to sudden shock, pressure, high temperature, or applied potential.
2) (adj.) Pertaining to or of the nature of an → explosion.

From explos(ion), → explosion + → -ive.

Oskaftâk, from oskaft-, stem of oskaftan, → explode, + -âk noun suffix.

The explosive processes that are believed to occur in supernovae. Explosive carbon burning occurs at a temperature of about 2 × 10⁹ degrees and produces the nuclei from neon to silicon. Explosive oxygen burning occurs near 4 × 10⁹ degrees and produces nuclei between silicon and calcium in atomic weight.At higher temperatures, still heavier nuclei are produced.

→ explosive; → nucleosynthesis.

1) The state or quality of being explosive.
2) A measure of the extent to which a material is explosive.

→ explosive; → -ity.

Math.: A symbol or number placed above and after another symbol or number (called the base) to denote the power to which the latter is to be raised. Examples: n in the expresseion aⁿ; 3 in the expression 2³.

From L. exponentem, pr.p. of exponere "put forth, explain," from → ex- "forth" + ponere "to put, to place."

Nemâ, agent noun of nemudan "to show, display," from Mid.Pers. nimūdan, from ne- "down; into;" O.Pers./Av. ni- "down; into," → ni-, + mun, Av. māy- "to measure," → display.

Of or expressed by a mathematical → exponent. → exponential curve, → exponential equation, → exponential function.

→ exponent + -ial, variant of → -al.

A curve that represents an → exponential function.

→ exponential; → curve.

An equation in which unknowns appear as exponents. Examples: 2^{3x + 1} = 32.

→ exponential; → equation.

A function in the form of y = b^x defined for every → real number x, with positive base b > 1.

→ exponential; → function.

In an exponential manner.

→ exponential; → -ly.

1a) To ship (commodities) to other countries or places for sale, exchange, etc.
1b) Computers: To save (documents, data, etc.) in a → format usable by another → software program.
2) The act of exporting (Dictionary.com).

From L. exportare "to carry out, bring out; send away,," from → ex- "away" + portare "carry."

Osbart "carrying away," from os-, → ex-, + bart variant of bord, bordan "to carry" (such as in dialects of Varzaneh barte, Nâin barte, Xonsâr birt, Esfahân bärten); Mid.Pers. burdan; O.Pers./Av. bar- "to bear, carry," barəθre "to bear;" Skt. bharati "he carries;" Gk. pherein; L. fero "to carry;" PIE base *bher- "to carry."

1) To reveal, make known, make visible.
2) In imaging, to subject, as to the action of light, or other electromagnetic radiations.

M.E. exposen, from O.Fr. exposer "lay open, set forth," from L. exponere "set forth, lay open, exhibit," with contamination from poser "to lay, place" (→ position). doublet of expound.

1) Osnehâdan, from os-, → ex-, + nehâdan "to put, place," → position.
2) nur dâdan, from nur, → light + dâdan "to give," Mid.Pers. dâdan "to give;" O.Pers./Av. dā- "to give, grant, yield," dadāiti "he gives;" cf. Skt. dadáti "he gives;" Gk. didomi "I give;" L. dare "to give, offer;" PIE base *do- "to give."

A formal exposition of facts.

From Fr. exposé, p.p. of exposer, "to → expose."

Noun from osnehâdan, → expose.

1) The act of setting forth information or a viewpoint.
2) Public exhibition or show.

Verbal noun of → expose.

1) The act of exposing; the fact or state of being exposed, → expose.
2) In optics, the total radiant energy incident on a surface per unit area. It is equal to the integral over time of the radiant flux density.

Verbal noun of → expose.

In photography, an instrument used to measure the intensity of light from a scene to be photographed and to indicate the camera lens and shutter settings required to expose the film correctly.

→ exposure; → meter.

The length of time during which the receiver is irradiated.

→ exposure; → time.

1) To transform ideas into words; utter or state.
2) Math: To → transform into equivalent → terms. For example by → expanding or → factorizing an → expression. See also → suppress, → impress.

M.E. expressen, O.Fr. espresser "to press, squeeze out; speak one's mind," M.L. expressare, frequentative of exprimere "represent, describe," literally "to press out," from → ex- "out" + pressare "to press, push," from L. premere "to press, hold fast, cover, compress."

Zohâvidan, from zo- variant of os- "out," → ex-, + hâv, from Av. hau- "to press, squeeze out;" cf. Mid.Pers. hunîdan "to express, extract (juice)," hâwan "mortar;" akin to Skt. sav- "to press, press out;" O.H.G. sou, O.E. sēaw "juice;" + -idan infinitive suffix.

1) The act or an instance of expressing.
2) Math.: A statement using mathematical quantities such as → scalars, → variables, → parameters, → functions, and → sets, as well as → relational and → logical  → operators such as → equality, → conjunction, → existence, → union, etc. (Steven. G. Krantz, ed., Dictionary of Algebra, Arithmetic, and Trigonometry, 2001).

→ express; → -tion.

To stretch out; draw out to the full length; to enlarge the scope of; to increase the length or duration of.

From O.Fr. estendre, from L. extendere "stretch out," from → ex- "out" + tendere "to stretch," see below.

Ostanidan, from os-, → ex- + tanidan as in Av. ustāna- "stretched out" (ustāna-zasta- "with outstretched hands"), cf. Skt. uttāná- "stretched out, spread out." Mod.Pers. tanidan "to spin, twist, weave;" Mid.Pers. tanitan, from Av. tan- to stretch, extend;" cf. Skt. tan- to stretch, extend," tanoti "stretches," tantram "loom;" Gk. teinein "to stretch, pull tight;" L. tendere "to stretch;" PIE base *ten- "to stretch."