Deponent verb
In linguistics, a deponent verb is a verb that is active in meaning but takes its form from a different voice, most commonly the middle or passive. A deponent verb has no active forms.
Languages with deponent verbs
This list may not be exhaustive.
Greek
Greek has middle-voice deponents (some of which are very common) and some passive-voice deponents. An example in Greek is ἔρχομαι (erchomai, I come or I go), middle/passive in form but active in translation.
Koine Greek has a few verbs which have very different meanings in the active and middle/passive forms. For example, ἁπτω ('hapto') means "I set fire to," whereas its middle form ἁπτομαι ('haptomai') means "I touch." Because ἁπτομαι is much more common in usage, beginners often learn this form first and are tempted to assume that it is a deponent.
Latin
Latin has passive-voice deponents, such as hortārī ('to exhort'), verērī ('to fear'), loquī ('to speak'), blandīrī ('to flatter'), and many more. (Deponent verbs are passive in form and active in meaning.) The forms regularly follow those of the passive of normal verbs: