[1] : The Collaborative International Dictionary of English v.0.48

addition \addi"tion\, n. f. addition, l. additio, fr. addere
   to add.
   1. the act of adding two or more things together; -- opposed
      to subtraction or diminution. "this endless addition
      or addibility of numbers." --locke.
      1913 webster

   2. anything added; increase; augmentation; as, a piazza is an
      addition to a building.
      1913 webster

   3. math. that part of arithmetic which treats of adding
      numbers.
      1913 webster

   4. mus. a dot at the right side of a note as an indication
      that its sound is to be lengthened one half. r.
      1913 webster

   5. law a title annexed to a man's name, to identify him
      more precisely; as, john doe, esq.; richard roe, gent.;
      robert dale, mason; thomas way, of new york; a mark of
      distinction; a title.
      1913 webster

   6. her. something added to a coat of arms, as a mark of
      honor; -- opposed to abatement.
      1913 webster

   vector addition geom., that kind of addition of two
      lines, or vectors, ab and bc, by which their sum is
      regarded as the line, or vector, ac.
      1913 webster

   syn: increase; accession; augmentation; appendage; adjunct.
        1913 webster
see also:
subtraction diminution abatement vector addition 

[2] : WordNet (r) 2.0

addition
     n 1: a component that is added to something to improve it; "the
          addition of a bathroom was a major improvement"; "the
          addition of cinammon improved the flavor" syn: add-on,
           improver
     2: the act of adding one thing to another; "the addition of
        flowers created a pleasing effect"; "the addition of a
        leap day every four years" ant: subtraction
     3: a quantity that is added; "there was an addition to property
        taxes this year"; "they recorded the cattle's gain in
        weight over a period of weeks" syn: increase, gain
     4: something added to what you already have; "the librarian
        shelved the new accessions"; "he was a new addition to the
        staff" syn: accession
     5: a suburban area laid out in streets and lots for a future
        residential area
     6: the arithmetic operation of summing; calculating the sum of
        two or more numbers; "the summation of four and three
        gives seven"; "four plus three equals seven" syn: summation,
         plus
see also:
add-on improver subtraction increase gain accession 
summation plus 

[3] : Moby Thesaurus II by Grady Ward, 1.0

271 moby thesaurus words for "addition":
   anschluss, l, access, accession, accessory, accident, accidental,
   accompaniment, accord, accretion, accrual, accruement,
   accumulation, acquirement, acquisition, addenda, addendum, adding,
   additament, additionally, additive, additory, additum, adjunct,
   adjuvant, advance, affairs, affiliation, affinity, agglomeration,
   aggrandizement, aggregation, agreement, alliance, also,
   amalgamation, ampliation, amplification, annex, annexation,
   appanage, appendage, appendant, appendix, appreciation,
   approximation, appurtenance, appurtenant, as well, as well as,
   ascent, assemblage, assimilation, association, attachment,
   attainment, augment, augmentation, auxiliary, ballooning, besides,
   beyond, blend, blending, bloating, bond, boom, boost, broadening,
   buildup, cabal, cartel, centralization, closeness, coalescence,
   coalition, coda, collateral, combination, combine, combining,
   combo, coming by, complement, composition, concomitant,
   confederacy, confederation, congeries, conglomeration, conjugation,
   conjunction, connectedness, connection, consolidation, conspiracy,
   contiguity, contingency, contingent, continuation, contrariety,
   corollary, crescendo, dealings, deduction, deployment, development,
   differentiation, disjunction, dispersion, division, dragging down,
   earnings, ecumenism, edema, elevation, ell, embodiment,
   encompassment, enlargement, enosis, equation, evolution, expansion,
   extension, extra, extrapolation, fanning out, federalization,
   federation, filiation, fixture, flare, flood, furthermore, fusion,
   gain, gaining, getting, getting hold of, greatening, growth, gush,
   happenstance, hike, hiking, homology, hookup, in addition,
   in addition to, incidental, inclusion, incorporation, increase,
   increment, inessential, inflation, integration, intercourse,
   interpolation, intimacy, into the bargain, inversion, involution,
   joining, jump, junction, junta, league, leap, liaison, link,
   linkage, linking, magnification, making, marriage, meld, melding,
   mere chance, merger, moneygetting, moneygrubbing, moneymaking,
   moreover, mounting, multiplication, mutual attraction, nearness,
   nonessential, not-self, notation, obtainment, obtention, offshoot,
   other, over and above, package, package deal, pendant, practice,
   procural, procurance, procuration, procurement, productiveness,
   proliferation, propinquity, proportion, proximity,
   putting together, raise, raising, rapport, reckoning, reduction,
   reinforcement, relatedness, relation, relations, relationship,
   rider, rise, secondary, securement, side effect, side issue,
   similarity, snowballing, solidification, splay, spread, spreading,
   subsidiary, subtraction, summation, summing-up, superaddition,
   supplement, surge, swelling, sympathy, syncretism, syndication,
   syneresis, synthesis, tailpiece, tie, tie-in, tie-up, to boot, too,
   transformation, trover, tumescence, undergirding, unessential,
   unification, union, uniting, up, upping, upsurge, upswing, uptrend,
   upturn, waxing, wedding, widening, wing, winning

[4] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

addition. whatever is added to a man's name by way of title, as additions of
estate, mystery, or place. 10 went. plead. 871; salk. 6; 2 lord ray. 988; :1
wus. 244, 5.
     2. additions of an estate or quality are esquire, gentleman, and the
like; these titles can however be claimed by none, and may be assumed by any
one.  in nash v. battershy 2 lord ray. 986 6 mod. 80, the plaintiff
declared with the addition of gentleman.  the defendant pleaded in abatement
that the plaintiff was no gentleman. the plaintiff demurred, and it was
held ill; for, said the court, it amounts to a confession that the plaintiff
is no gentleman, and then not the person named in the count.  he should have
replied that he is a gentleman.
     3. additions of mystery are such as scrivener, painter, printer,
manufacturer, c.
     4. additions of places are descriptions by the place of residence, as
a. b. of philadelphia and the like. see bac. ab. b. t.; doct. pl. 71; 2 vin.
abr. 77; 1 lilly's reg. 39; 1 metc. r. 151.
     5. at common law there was no need of addition in any case, 2 lord ray.
988; it was, required only by stat. 1 h. 5. c. 5, in cases where process of
outlawry lies.  in all other cases it is only a description of the person,
and common reputation is sufficient. 2 lord ray. 849.  no addition is
necessary in a homine replegiando. 2 lord ray. 987; salk. 5; 1 wils. 244, 6;
6 rep. 67.

Addition >> A Words
Addition, definition of term: Addition
addition_pag1.html

In Addition >> I Words
In Addition, definition of term: In Addition
in+addition_pag1.html

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