The Collaborative International Dictionary of English v.0.48:

Chore \Chore\ (ch[=o]r), n. [The same word as char work done by
   the day.]
   A small job; in the pl., the regular or daily light work of a
   household or farm, either within or without doors. [U. S.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chore \Chore\, v. i. [imp. & p. p. Chored; p. pr. & vb. n.
   Choring.]
   To do chores. [U. S.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chore \Chore\, n.
   A choir or chorus. [Obs.] --B. Jonson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chore
    n 1: a specific piece of work required to be done as a duty or
         for a specific fee; "estimates of the city's loss on that
         job ranged as high as a million dollars"; "the job of
         repairing the engine took several hours"; "the endless task
         of classifying the samples"; "the farmer's morning chores"
         [syn: job, task, chore]

Moby Thesaurus II by Grady Ward, 1.0:

71 Moby Thesaurus words for "chore":
   Augean task, Herculean task, administer to, assignment, attend,
   attend on, backbreaker, ballbuster, bitch, busywork, care for,
   char, chare, charge, commission, dance attendance upon, dead lift,
   devoir, do chars, do for, do service to, do the chores, drudge,
   duty, effort, errand, exercise, fish to fry, handful, hard job,
   hard pull, heavy sledding, help, homework, job, job of work, labor,
   lackey, large order, look after, maid, make-work, man-sized job,
   matters in hand, minister to, mission, odd job, pander to,
   piece of work, project, rough go, serve, service, stint,
   take care of, tall order, task, tend, things to do, tough job,
   tough proposition, trial, tribulation, turn a hand, uphill work,
   upon, valet, wait, wait on, work, work for