In a way that involves or belongs to a whole community or group of people sharing something together.
From 'communal' (Latin communis, 'common') plus the adverbial suffix -ly. The sense evolved from describing things held in common to how actions are performed collectively.
This word captures something fundamental about human organization—societies that do things 'communally' often have very different power structures and resource distribution than individualistic ones, which is why anthropologists watch for this word when studying cultures.
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