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

Not precise; not exact; vague.

From im-, variant of → in- + → precise.

The quality of lacking → precision.

From im-, variant of → in- + → precision.

1) To press, to apply with pressure, especially to leave a mark.
2) To produce a profound effect upon the mind.

→ in-; → press.

1) A strong effect produced on the intellect, feelings, conscience, etc.
2) The first and immediate effect of an experience or perception upon the mind (dictionary.com).

→ press + -ion variant of → -tion.

Capable of being impressed; easily impressed.

→ impress; → -able.

1) A style of painting developed in the last third of the 19th century, characterized chiefly by short brush strokes of bright colors in immediate juxtaposition to represent the effect of light on objects.
2) A manner of painting in which the forms, colors, or tones of an object are lightly and rapidly indicated.
3) A manner of sculpture in which volumes are partially modeled and surfaces roughened to reflect light unevenly (Dictionary.com).

→ impression; → -ism.

Having the power to impress, to raise admiration, awe, respect, etc.

→ impress; → -ive.

The lack of a fixed phase relationship between two or more waves. → coherent.

Incoherent, from negation prefix → in- + → coherent; → wave.

A flow whose volume or density does not change under pressure, and therefore its density is a constant. In other words, an ideal flow in which the → divergence of velocity is zero. → compressible flow.

→ incompressible, from → in "not" + → compressible; → flow.

1) To make or become greater, in number, size, degree, etc..
2) The act of increasing. The amount by which something increases.

M.E., from O.Fr. encreiss-, pr.p. stem of encreistre, from L. increscere "to increase, to grow upon," from → in- "in" + crescere "to grow," → crescent.

Afzudan, from Mid.Pers. abzudan "to increase, grow," O.Pers. abijav- "to increase, add to, promote," from abi-, aiby- "in addition to; to; against" + root jav- "press forward," Av. gav- "to hasten, drive," Sk. jav- "to press forward, impel quickly, excite," javate "hastens."

The amount by which a varying quantity increases between two of its stages. In → calculus, the Greek letter Δ (delta) is used to denote an increment; e.g. Δx is an increment of x, contrasted to → decrement.

Increment, from L. incrementum "growth, increase," from stem of increscere "to grow in or upon" from → in- "in" + crescere "to grow."

Fazâyé, from fazâ shortened present stem of afzudan "to add, increase" (Mid.Pers. abzudan "to increase, grow;" O.Pers. abijav- "to increase, add to, promote," from abi-, aiby- "in addition to; to; against" + root jav- "press forward;" Av. gav- "to hasten, drive;" Skt. jav- "to press forward, impel quickly, excite," javate "hastens") + -y- euphonic infix + -é noun/nuance suffix.

Same as → refractive index.

→ index; → refraction.

Not in a direct course, path, action, or procedure.

→ in-; → direct.

A word or group of words representing the person or thing with reference to which the action of a verb is performed. In English generally coming between the verb and the direct object and paraphrasable as the object of a preposition, usually to or for, following the direct object, as the boy in He gave the boy a book (Dictionary.com).

→ indirect; → object.

Current resulting from the relative motion of a conductor through a magnetic field.

→ induced ; → current.

Reasoning from detailed facts to general principles.

→ deductive; → reasoning.

A → reference frame or coordinate system in which there are no accelerations, only zero or uniform motion in a straight line. According to the special theory of relativity, it is impossible to distinguish between such frames by means of any internal measurement.

→ inertial; → reference; → frame.

1) The act or process of deriving logical conclusions from premises known or assumed to be true.
2) Something that is inferred.

From M.L. inferentia, from inferre, from → in- "in" + ferre "to carry, bear," cognate with Pers. bordan "to carry, bear," as below.

Darbord (on the models of daryâft "perception" and peybord "understanding, finding;" see also bâzbord, → reference), from dar-, → in-, + bord past stem of bordan "to carry, bear;" (Mid.Pers. burdan; O.Pers./Av. bar- "to bear, carry," Av. barəθre "to bear (infinitive);" Skt. bharati "he carries;" Gk. pherein; L. fero "to carry;" PIE base *bher- "to carry").

The global network of all the world's communications, databases, and sources of information.

→ information; → sphere.

The invisible part of electromagnetic spectrum possessing wavelengths between those of visible light and those of radio waves, i.e. approximately between about 0.75 and 1000 μm.

From L. infra (adv., prep.) "below, underneath, beneath," inferus "lower," from PIE *ndher; cf. Av. aδara- (adj.), aδairi- (prep.) "below;" Mid.Pers. êr "below, down; low, under," adar "low," azêr "below, under" (Mod.Pers. zir "below, down"); Skt. ádhara- "lower;" O.E. under "under, among"); → red.

Forusorx, from foru "down, downward; below; beneath;" Mid.Pers. frôt "down, downward;" O.Pers. fravata "forward, downward;" cf. Skt. pravát- "a sloping path, the slope of a mountain," + sorx→ red.