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

tack \tack\, v. t. imp.  p. p. tacked; p. pr.  vb. n.
   tacking. cf. od. tacken to touch, take, seize, fix, akin
   to e. take. see tack a small nail.
   1. to fasten or attach. "in hopes of getting some commendam
      tacked to their sees." --swift.
      1913 webster

            and tacks the center to the sphere.   --herbert.
      1913 webster

   2. especially, to attach or secure in a slight or hasty
      manner, as by stitching or nailing; as, to tack together
      the sheets of a book; to tack one piece of cloth to
      another; to tack on a board or shingle; to tack one piece
      of metal to another by drops of solder.
      1913 webster

   3. in parliamentary usage, to add a supplement to a bill;
      to append; -- often with on or to; as, to tack on a
      non-germane appropriation to a bill. --macaulay.
      1913 webster

   4. naut. to change the direction of a vessel when sailing
      closehauled, by putting the helm alee and shifting the
      tacks and sails so that she will proceed to windward
      nearly at right angles to her former course.
      1913 webster

   note: in tacking, a vessel is brought to point at first
         directly to windward, and then so that the wind will
         blow against the other side.
         1913 webster
see also:
tacked tacking tack 

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

tacking \tack"ing\, n. law
   a union of securities given at different times, all of which
   must be redeemed before an intermediate purchaser can
   interpose his claim. --bouvier.
   1913 webster

   note: the doctrine of tacking is not recognized in american
         law. --kent.
         1913 webster

[3] : WordNet (r) 2.0

tacking
     n 1: loose temporary stitches syn: baste, basting
     2: nautical the act of changing tack syn: tack
see also:
baste basting tack 

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

tacking, eng. law. the union of securities given at different times, so as 
to prevent any intermediate purchasers claiming title to redeem, or 
otherwise discharge one lien, which is prior, without redeeming or 
discharging other liens also, which are subsequent to his own title. jer. 
eq. jur. b. 1, c. 2, sec. 1, p. 188 to 191; 1 story, eq. jur. sec. 412. 
     2. it is an established doctrine in the english chancery that a bona 
fide purchaser and without any notice of a defect in his title at the time 
of the purchase, may lawfully buy any statute, mortgage, or encumbrance, and 
if he can defend by those at law, his adversary shall have no help in equity 
to set those encumbrances aside, for equity will not disarm such a 
purchaser. and as mortgagees are considered in equity as purchasers pro 
tanto, the same doctrine has extended to them, and a mortgagee who has 
advanced his money without notice of any prior encumbrance, may, by getting 
an assignment of a statute, judgment, or recognizance, protect himself from 
any encumbrance subsequent to such statute, judgment or recognizance, though 
prior to his mortgage; that is, he will be allowed to tack or unite his 
mortgage to such old security, and will by that means be entitled to recover 
all moneys for which such security was given, together with the money due on 
his mortgage, before the prior. mortgagees are entitled to recover anything. 
2 fonb. eq. 306; 2 cruise, t. 15, c. 5, s. 27; powell on morg. index, h.t.; 
1 vern. 188; 8 com. dig. 953; madd. ch. index, h.t. 
     3. this doctrine is inconsistent with the laws of the several states, 
which require the recording of mortgages. caines' cas. er. 112; 1 hop. c. r. 
231; 3 pick. 50; 2 pick. 517. 
     4. the doctrine of tacking seems to have been acknowledged in the civil 
law, code, 8, 27, 1; but see dig. 13, 7, 8; and see 7 toull. 110. but this 
tacking could not take place to the injury of intermediate encumbrancers. 
story on eq. sec. 1010, and the authorities cited in the note. 

Tacking >> T Words
Tacking, definition of term: Tacking
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