IPA: /ˌdɛpəˈzɪʃən/
KK: /dɛpəˈzɪʃən/
A formal statement made by a witness, usually recorded for use in a legal case, or the act of placing something down.
The lawyer prepared for the deposition of the key witness in the trial.
Deposition → It is formed from "de-" (meaning down or away) and "ponere" (meaning to place). The word refers to the act of placing something down, particularly in a legal context where a witness's testimony is placed on record.
Think of 'placing down' ('ponere') something 'away' ('de-') — that's why deposition refers to putting down a witness's testimony.