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The Collaborative International Dictionary
Assientist

Assientist \As`si*en"tist\, n. [Cf. F. assientiste, Sp. asentista.] A shareholder of the Assiento company; one of the parties to the Assiento contract.
--Bancroft. [1913 Webster] ||

Wiktionary
assientist

n. 1 (context historical English) A shareholder of the (w: Assiento) company involved in the slave trade. 2 (context historical English) One of the party to the Assiento contract.