To join together in association or fellowship; to unite or combine with others into a society or group.
From Latin consociatus, past participle of consociare (con- 'together' + sociare 'to unite, from socius 'companion, ally'). Means literally to make into companions together.
In ecology, a 'consociation' is a group of plants living together harmoniously—the word captures how creatures and plants literally 'consociate' themselves into communities!
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