1. A collection of objects laid on top of each other
   "The heap of rocks at the base of the cliff grew over time";
   - pile, mound, agglomerate, cumulation, cumulus
    
2. (often followed by ‘of’) a large number, amount or extent
   "a heap of letters";
   - batch, deal, flock, good deal, great deal, hatful, lot, mass, mess, mickle [archaic], mountain, muckle, passel [US], peck, pile [informal], plenty, pot, quite a little, raft, sight, slew, spate, stack [informal], tidy sum, wad, bunch [informal], scad [N. Amer, informal]
    
3. [informal] A car that is old and unreliable
   "the fenders had fallen off that old heap";
   - bus [informal], jalopy [informal], flivver [N. Amer, informal], clunker [N. Amer, informal], banger [Brit, informal], beater [N. Amer, informal], hooptie [US, informal]
    
4. (computing) a data structure consisting of trees in which each node is greater than all its children
   "The priority queue was implemented using a heap data structure"

1. Arrange in stacks
   "heap firewood around the fireplace";
   - stack, pile
    
2. Bestow in large quantities
   "He heaped him with work"; "She heaped scorn upon him"
    
3. Fill to overflow
   "heap the platter with potatoes"

Derived forms: heaps, heaping, heaped

See also: stack up, stacked

Type of: accumulation, aggregation, arrange, assemblage, auto [informal], autocar [archaic], automobile [N. Amer], car, collection, dysphemism, fill, fill up, give, large indefinite amount, large indefinite quantity, motor [Brit, informal], motorcar, set up, wheel [informal], whip [US, informal]

Encyclopedia: Heap, Mark