The Collaborative International Dictionary of English v.0.48:

Tot \Tot\, n. [Cf. Toddle, Tottle, Totter.]
   1. Anything small; -- frequently applied as a term of
      endearment to a little child.
      [1913 Webster]

   2. A drinking cup of small size, holding about half a pint.
      [Prov. Eng.] --Halliwell.
      [1913 Webster]

   3. A foolish fellow. [Prov. Eng.] --Halliwell.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tot \Tot\, n. [L.]
   Lit., so much; -- a term used in the English exchequer to
   indicate that a debt was good or collectible for the amount
   specified, and often written opposite the item.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Tot \Tot\, v. t. [imp. & p. p. Totted; p. pr. & vb. n.
   Totting.]
   1. To mark with the word "tot"; as, a totted debt. See Tot,
      n.
      [Webster 1913 Suppl.]

   2. [Cf. Total.] To add; to count; to make up the sum of; to
      total; -- often with up. [Colloq., Eng.]

            The last two tot up the bill.         --Thackeray.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

tot
    n 1: a small amount (especially of a drink); "a tot of rum"
    2: a young child [syn: toddler, yearling, tot, bambino]
    v 1: determine the sum of; "Add all the people in this town to
         those of the neighboring town" [syn: total, tot, tot
         up, sum, sum up, summate, tote up, add, add
         together, tally, add up]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "tot":
   add, bairn, beverage, bumper, cast, cherub, child, chit, darling,
   draft, dram, drench, drink, drop, figure, foot, gulp, guzzle,
   innocent, jolt, kid, kitten, lamb, lambkin, lap, libation,
   little bugger, little fellow, little guy, little innocent,
   little one, little tad, little tot, mite, nip, nipper, offspring,
   peewee, peg, portion, potation, pull, quaff, shaver, shot, sip,
   slug, slurp, snifter, snort, suck, sum, summate, sup, swig, swill,
   tad, total, tote, wee tot



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TOT
       Time Offset Table (DVB)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

TOT
       Totally Off-Topic (slang, Usenet, IRC)