noun

• (British, informal) A short mid-morning break taken around eleven o'clock for a drink or light snack.
  "The harvestmen who board in the farm-houses fare sumptuously during the month of harvest.— […] at eleven o'clock in the morning, and four in the afternoon, they have each a large light plum-bun, with a pint of ale a piece, carried into the field, to encourage them to work cheerfully. These extra refreshments they call, in their provincial language, their "elevenses" and "fourses." I could not at first imagine what the servants meant by talking of carrying the harvestmen their elevenses and fourses, till Mrs. Henley explained that it was a vulgar abbreviation of the four-o'clock and eleven o'clock meals."