"of or causing the quality of adhering together; capable of sticking," 1730, with -ive + Latin cohaes-, past participle stem of cohaerere "to cleave together," in transferred use, "be coherent or consistent," from assimilated form of com "together" (see co-) + haerere "to adhere, stick" (see hesitation). Related: Cohesively; cohesiveness.
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