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

1) Roughness or unevenness of surface.
2) Physics: A microscopic projection on a metal surface resulting from normal surface finishing processes.
3) Geology: A site on a → fault surface where the two sides are held together by an area of higher strength than the areas surrounding it. When the stress on the fault exceeds the strength of the asperity, the asperity fails as an → earthquake.

M.E. asperite, from O.Fr. asperité "difficulty, painful situation," from L. asperitas, from asper "rough, harsh," of unknown origin.

From zaft "thick, gross, rude," (Steingass, Dehxodâ), + noun suffix -i.

A company of persons gathered for a common reason, as for deliberation, legislation, worship, or entertainment.
The act of assembling; the state of being assembled.

M.E. assemblee, from M.Fr., from O.Fr., from assembler "to gather together."

Hamâyeš, from ham- "together," → com- + âyeš "coming," from ây- present stem of âmadan "to come;" O.Pers. aitiy "goes;" Av. ay- "to go, to come," aēiti "goes;" cf. Skt. e- "to come near," eti "arrival;" Gk. eimi "I go," L. ire "to go, walk," eo "I go;" Tokharian AB i-; PIE *ei- "to go, to walk."

To state with assurance, confidence, or force; state strongly or positively; affirm.

From L. assertus, p.p. of asserere/adserere "to claim, lay claim to, declare," from → ad- "to" + serere "to join together, range in a row," from PIE root *ser- (2) "to line up."

Sotvârdan from sotvâr, ostovâr "firm, reliable," Mid.Pers. awestwâr, ôst "firm, reliable," O.Pers./Av. sta- "to stand; set," (Av. hištaiti, cf. Skt. sthâ- "to stand," Gk. histemi "put, place, weigh," stasis "a standing still," L. stare "to stand"); PIE base *sta- "to stand."

The act of asserting or something that is asserted.

→ assert; → -tion.

1) To give or allocate; allot.
2) To give out or announce as a task.
3) To designate; name; specify (Dictionary.com).

M.E. assignen, from O.Fr. assiginer "assign; appoint legally; allot," from L. assignare "to mark out, to allot by sign," from → ad- "to" + signare "to make a sign," from signum "mark," → sign

Nešârdan, from neš, → sign, + nuance suffix -âr.

1) An appointment for a meeting.
2) The act of assigning; → assignment (Dictionary.com).

Verbal noun of → assign.

1) An act of assigning; appointment.
2) Something assigned, as a particular task or duty.
3) A position of responsibility, post of duty, or the like, to which one is appointed (Dictionary.com).

Verbal noun of → assign.

1) (v.tr.) To join or connect together; to bring together or into relationship in any of various intangible ways (as in memory or imagination). → dissociate.
2) (v.intr.) To come or be together as partners, friends, or join with other parts.
3) A person joined with another or others in business or at work; something that usually accompanies another thing.

M.E. associat "associated," from L. associatus, p.p. of associare "to unite," from ad- + sociare "to join," from socius "ally, companion" ("follower"); PIE base *sek^w- "to follow."

Âhazidan, from â- prefix + hazidan "to associate, accompany, follow," from Av. hac-, hax- "to associate, follow, accompany" (hacenay- "getting together, association," haxay-, hašy-, haš- "friend"), hacaiti "follows;" hacā "from, out of;" O.Pers. hacā "from" (Mid.Pers. hâz- "to lead, guide," hac "from;" Mod.Pers. az "from"); PIE base *sek^w- "to follow;" cf. Skt. sac- "to be associated or united with," sácate "accompanies, follows," sácā "with;" Gk. hepesthai "to follow;" L. sequi "to follow."
Âhazgâr, from âhaz- present stem of âhazidan + agent noun suffix -gâr, → -or, as in âmuzgâr, parhizgâr, sâzgâr, âmizgâr, sepuzgâr.

A → molecular cloud that is physically or apparently related to a star formation region.

→ associate; → molecular; → cloud.

1) The act of associating, → associate; the state of being associated.
2) A group of → astronomical objects physically or apparently gathered in a particular area of sky, for example an → stellar association.
3) An organization of persons having a common interest. → dissociation.

Association, noun from → associate.

Âhazeš, verbal noun of → âhazidan→ associate. Anjoman, for the meaning 3, from Mid.Pers. anjaman, from Av. han-jamana, from han- "together" + jamana, from gam- "to come;" cf. Skt. samgamana "gathering together."

A celestial body making part of an astronomical association.

→ association; → member.

1) Of, characterized by, resulting from, or causing association.
2) In a mathematical operation, being independent of the sequence in which the elements are grouped. For ex., if a + (b + c) = (a + b) + c, the operation indicated by + (addition) is associative.

Adj. from associate.

An algebra whose multiplication is associative.

→ associative; → algebra.

A basic rule in → group theory stating that if a, b and c are members of a group then (a * b) * c and a * (b * c) are members of the group.

→ associative; → axiom.

In mathematics, the rule that states that the result of two identical operations is independent of the sequence of these operations. For ex., in the addition operation, a + (b + c) = (a + b) + c = a + b + c. Multiplication of numbers is also associative.

→ associative; → law.

Of or relating to association; state of being associative.

→ associative + → -ity.

To take as granted or true; suppose.

M.E., from L. assumere "to take up," from ad- "to, up" + sumere "to take," from sub "under" + emere "to take."

Âgarbidan, from âgarb, → assumption.

A fact or statement (as a proposition, axiom, postulate, or notion) taken for granted.

M.E., from L.L. assumption, assumptio "taking up," from L. assumere, → assume.

Âgarb, from â-, nuance prefix, + garb, from Av./O.Pers. grab-, Av. gərəb- "to take, to seize;" cf. Mod.Pers. gereftan "to take; to assume;" Skt. grah-, grabh- "to seize, to take," graha "seizing, holding, perceiving;" M.L.G. grabben "to grab;" E. grab "to take or grasp suddenly;" PIE *ghrebh- "to seize."
Ar. farz "assumption, hypothesis."

A positive declaration intended to give confidence; promise or pledge; guaranty; surety (Dictionary.com).

→ assure; → -ance.

1) To declare earnestly to; inform or tell positively; state with confidence to.
2) To give confidence to; encourage.

M.E. as(e)uren, assuren, from O.Fr. aseurer, from L.L. assecurare, from as-, variant of → ad-, + secur-, → secure, + -a- thematic vowel, + -re infinitive suffix.

Âtenzidan, from â- intensive prefix, + tenz, → sure, + -idan infinitive suffix, → -ize.