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

1) General: Determined or conditioned by something else.
2) Math.: A variable whose value depends on the value assigned to another variable.
3) Statistics: An event which is not independent.

M.E. dependant, from M.Fr., pr.p. of dépendre, from L. dependere, from → de- + pendere "to hang, be suspended," PIE base *(s)pen(d)- "to pull, stretch."

Vâbasté, from vâ-→ de- + basté p.p. of bastan "to bind, shut," from Mid.Pers. bastan/vastan "to bind, shut," Av./O.Pers. band- "to bind, fetter," banda- "band, tie," cf. Skt. bandh- "to bind, tie, fasten," PIE *bhendh- "to bind" (Ger. binden, E. bind).

Math.: A variable whose value depends on the value assigned to another value. For example, in the equation y = 2x, the value of y depends on that of x. See also → independent variable.

→ dependent; → variable.

To make two signals out of phase. For example, to get one signal at its highest peak while the other signal is at its lowest peak; they will be 180 degrees out of phase.

→ de-; → phase.

Same as → out of phase.

Past participle of → dephase.

To decrease markedly the supply or abundance of; exhaust; to cause → depletion.

From L.L. depletionem "blood-letting," from L. deplere "to un-fill, to empty out," from → de- "off, away" + plere "to fill," from plenus "full," from PIE *ple- "to be full," PIE base *pelu- "full," cf. O.Pers. paru- "much, many," Av. parav-, pauru-, pouru-, par- "to fill," Mod.Pers. por "full," Skt. puru-, Gk. polus. por "full," Gk. polus, O.E. full "full," from P.Gmc. *fullaz, O.H.G. fol, Ger. voll, Goth. full.

Tisâyidan, from Tabari tisâ "empty, naked, bare" + -idan infinitive suffix. Variants of tisâ in dialects and literary Pers.: Saraxsi, Lâsgardi, Sangesari tusâ "empty, naked," Aftari tussâ "empty," literary Pers. tohi "empty," Mid.Pers. tuhig, Av. taoš- "to become empty," pres. tusa-, caus. taošaya-, tusən "they lose their posture," Skt. tuccha-, tucchya- "empty," L. tesqua, tesca "deserted place," Russian tošcij "hollow;" PIE base *teus- "to empty."

General: The act or process of depleting. The state of being depleted.
Astro.: The process or state of a material which contains less of a particular chemical element or isotope than the expected standard amount.

Noun from → deplete

The region of a semiconductor in which the density of mobile carriers is too low to neutralize the fixed charge density of donors and acceptors.

→ depletion; → layer.

The time it takes for a given → chemical species to be reduced below a significant level of → abundance in a → compound or → object.

→ depletion; → time.

Reducing or randomizing the polarization of an electromagnetic wave, by transmission through a non-homogeneous medium or a depolarizer.

from → de- + → polarization.

To remove or reduce the population of, as by destruction or expulsion (Dictionary.com).

→ de-; → populate.

To expel forcibly a foreigner from a country; banish.

→ de-; → export.

The action of deporting an alien from a country.

→ deport; → -tion.

1a) Something precipitated, delivered and left, thrown down, or accumulated, as by a natural process.
1b) Substance which settles down from a solution or a suspension, such as the natural sediment of wine in a bottle. See also → sediment.
2) To leave or form a layer of some substance (sand, sediment, etc.) as a gradual process in one place, or be left in this way.

From L. depositus, p.p. of deponere "to lay aside, put down," from → de- "away" + ponere "to put," → position.

Lerd "sediment, tartar of wine," probably a variant of dord "dregs, lees, sediment, tartar of wine."

The process by which water vapor changes directly to ice without first becoming a liquid. This is how snow forms in clouds, as well as frost and hoar frost on the ground. The opposite of deposition is → sublimation. → condensation.

M.E., from O.Fr. deposition, from L. deposition- "putting aside, testimony, burial," from deposit(us) "laid down," p.p. of deponere "to put down," from → de- + ponere "to put, place."

Vâneheš, from vâ-→ de- + neheš verbal noun of nehâdan "to put, place," Mid.Pers. nihâtan, O.Pers./Av. ni- "down; into," → ni-, + dā- "to put; to establish; to give," dadāiti "he gives," cf. Skt. dadâti "he gives," Gk. didomi "I give," L. do "I give;" PIE base *do- "to give."

An act of attacking or plundering.

→ de-; → predation.

1) Navigation:→ dip.
2) Meteorology: An area of low atmospheric pressure.
3) Geology: An area of the Earth's crust sunken or depressed below the surrounding area, formed by various mechanisms.

Depression, verbal noun of depress, from O.Fr. depresser, from L.L. depressare, frequentative of pressus, p.p. of deprimere "press down," from → de- "down" + premere "to press."

1) Našib-e ofoq, from našib "declivity, descent; lowness of ground, slope of any place" (Mid.Pers. nišēp "declivity, (astrology) dejection," Av. *nixšvaēpā-, xšvaēpā- "bottom, rear") + ofoq→ horizon. 2) Forubâr, from foru "down, downward; below; beneath," → de- + bâr "load, pressure, charge," → charge. 3) Našiblâx, from našib, as above, in item 1, + -lâx place suffix.

To remove or withhold something from the enjoyment or possession of (Dictionary.com).

M.E. depriven, from O.Fr. depriver, from L. deprivare, from → de- + privare "to separate, rob," → private

Âzvandan, from âz- "out, away," → ex-, + van, contraction of vand, band "to bind, fasten, close," → private.

Noun form of → deep. → optical depth.

From M.E. depthe, from O.E. deop "deep," → deep + -the "-th."

Žarfâ, noun of žarf "deep," → deep + -â.

1) General: The act or fact of deriving or being derived; origin; descent.
2) Math.:→ differentiation; development of a theorem.
3) Grammar: The formation of a word from another word or base. It typically occurs by the addition of an affix.

Verbal noun of → derive.

1) General: Derived from another; not original or primitive.
2) Math.: For a → function  y = f(x), the → limit of the → ratio of the → increment of the function, Δy, to the increment of the → variable, Δx, as the latter tends to → zero. Derived function; result of → differentiation.
3) Chemistry: Substance derived or prepared from some other → substance.

From M.E. derivatif, from L.L. derivativus, from derivat(us), p.p. of derivare, → derive + -ivus.

Vâxané, noun from vâxan, present stem of vâxanidan, → derive.