How to Say "intervened" in Spanish
The Spanish word for “intervened” is “mediado” — B1 level. This is a very common word in everyday Spanish.

Examples
El director ha mediado en la disputa entre los alumnos.
The principal has intervened in the dispute between the students.
Si no hubieras mediado, la situación sería peor.
If you hadn't intervened, the situation would be worse.
Han mediado meses entre los dos eventos.
Months have passed (intervened) between the two events.
Using 'Haber' with Mediado
To say 'have intervened,' always use the verb 'haber' followed by 'mediado.' In this specific job, the word 'mediado' never changes its ending (it doesn't become mediada or mediados).
The 'I' in Media
Mistake: “Saying 'yo medéo'.”
Correction: Say 'yo medio'. The verb follows the pattern of regular -ar verbs, keeping the 'i' from the root 'medi-'.
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