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.

Syn. — Increase; accession; augmentation; appendage; adjunct.

(Ad*di"tion*al) a. Added; supplemental; in the way of an addition.

(Ad*di"tion*al), n. Something added. [R.] Bacon.

(Ad*di"tion*al*ly), adv. By way of addition.

(Ad*di"tion*a*ry) a. Additional. [R.] Herbert.

(Ad`di*ti"tious) a. [L. addititius, fr. addere.] Additive. [R.] Sir J. Herschel.

(Ad"di*tive) a. [L. additivus.] (Math.) Proper to be added; positive; — opposed to subtractive.

(Ad"di*to*ry) a. Tending to add; making some addition. [R.] Arbuthnot.

(Ad"dle) n. [OE. adel, AS. adela, mud.]

expressing habitual earnestness in the pursuit of some favorite object; as, devoted to science. Consecrate and dedicate express devotion of a higher kind, involving religious sentiment; as, consecrated to the service of the church; dedicated to God.

(Ad*dict"ed*ness), n. The quality or state of being addicted; attachment.

(Ad*dic"tion) n. [Cf. L. addictio an adjudging.] The state of being addicted; devotion; inclination. "His addiction was to courses vain." Shak.

Addison's disease
(Ad"di*son's dis*ease") [Named from Thomas Addison, M. D., of London, who first described it.] (Med.) A morbid condition causing a peculiar brownish discoloration of the skin, and thought, at one time, to be due to disease of the suprarenal capsules (two flat triangular bodies covering the upper part of the kidneys), but now known not to be dependent upon this causes exclusively. It is usually fatal.

(Ad*dit"a*ment) n. [L. additamentum, fr. additus, p. p. of addere to add.] An addition, or a thing added. Fuller.

My persuasion that the latter verses of the chapter were an additament of a later age.

(Ad*di"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.

2. Anything added; increase; augmentation; as, a piazza is an addition to a building.

3. (Math.) That part of arithmetic which treats of adding numbers.

4. (Mus.) A dot at the right side of a note as an indication that its sound is to be lengthened one half. [R.]

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.

6. (Her.) Something added to a coat of arms, as a mark of honor; — opposed to abatement.

  By PanEris using Melati.

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