Definition
To accumulate is to grow by addition so small it looks like nothing: dust accumulates on a shelf, interest accumulates in an account, evidence accumulates against a theory. No single increment matters — that is precisely the trick. The word, from the Latin cumulus ('a heap'), names the quiet mathematics by which trivial amounts become fortunes, archives, and avalanches, provided they keep arriving.
Examples
- Over thirty years of small monthly deposits, she accumulated a surprising fortune.
- Evidence accumulated until the original theory could no longer be defended.
- Snow accumulated on the pass overnight, closing the road by morning.
Synonyms
amass · build up · gather · collect · pile up
In TOEFL & IELTS
Core academic vocabulary in both exams: TOEFL passages have sediment, toxins, and capital accumulating; IELTS Writing Task 1 uses 'accumulated total'. The noun 'accumulation' and phrase 'the accumulation of wealth/knowledge/evidence' are high-band staples. Useful contrast pair: accumulate (gradual) vs. acquire (single act).