This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. That tends to assimilate, or to produce assimilation

adj. Tending to assimilate, or produce assimilation.

Tending to assimilate; producing assimilation; assimilative: as, assimilatory organs.

adj. capable of taking (gas, light, or liquids) into a solution

"And this assimilatory process was racialized from its inception because no blacks and few Asians were permitted to take part, in the sense that they were excluded from regiments defined as white."

absorptive    absorbent