Also means
to join (a group or cause)
Usage Note
Aderire is an irregular -ire verb conjugated like finire (aderisco, aderisci…). It takes the preposition a when meaning 'to join' or 'to subscribe to': aderire a un partito means to join a party. It uses avere as its auxiliary in compound tenses.
Examples
"Molti cittadini hanno aderito alla protesta."
Natural Translation
Many citizens joined the protest.

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