IPA: /ˌriːkælˈkjuːleɪʃən/
KK: /ˌriːˌkæl.kjʊˈleɪ.ʃən/
The process of calculating something again, usually to correct or update a previous calculation.
After the error was found, a recalculation of the budget was necessary.
Recalculation is formed from "re-" (meaning again) and "calculation" (from Latin "calculatio", meaning a counting or reckoning). The word refers to the act of counting or calculating something again.
Think of doing a count or calculation 'again' — 're-' means again, and 'calculatio' relates to counting.