What is the meaning of Deponent?

Having an active meaning, but conjugating as though it were being used with a different voice (such as the passive).

A witness; especially one who gives information under oath, in a deposition concerning facts known to him or her.

A deponent verb.

. verb conjugated passively but used actively.

third-person plural future active indicative of dēpōnō

deponent

deponent

depositor

Source: wiktionary.org