ETYMOLOGY
from Latin acervāt- past participial stem of acervare (to make into heaps, to pile up),
from acervus (a heap)
EXAMPLE
“…The mass of burning embers, by which the oven had been heated, was not, as he pretended, fairly swept out. Those that were well ignited were acervated (heaped up) into one corner; and the steak, so far from being left to the action of the heated air of the oven, was put between two tin dishes, and was embedded in the mass of the burning embers in the corners. …”
From: Arcana of Science and Art
Or, An Annual Register of Popular Inventions and Improvements
Printed by John Limbird, 1830
‘Chemical Science. The Fire King’
Lexicophilia 