Webster’s Revised Unabridged Dictionary · 1913
Designment
De·sign′ment (·ment), n. 1. Delineation; sketch; design; ideal; invention. [Obs.]
For though that some mean artist's skill were shown In mingling colors, or in placing light, Yet still the fair designment was his own. Dryden.
2. Design; purpose; scheme. [Obs.] Shak.