1 To furnish or give experimental knowledge of; to make (one) to know; to make familiar; — followed by with. Before a man can speak on any subject, it is necessary to be acquainted with it. Locke. A man of sorrows and acquainted with grief. Isa. liii. 3.
2 To communicate notice to; to inform; to make cognizant; — followed by with (formerly, also, by of), or by that, introducing the intelligence; as, to acquaint a friend with the particulars of an act. Acquaint her here of my son Paris’ love. Shak. I must acquaint you that I have received New dated letters from Northumberland. Shak.
3 To familiarize; to accustom. [Obs.] Evelyn. To be acquainted with, to be possessed of personal knowledge of; to be cognizant of; to be more or less familiar with; to be on terms of social intercourse with.