From The Collaborative International Dictionary of English v.0.48:
Situate \Sit"u*ate\ (?; 135), Situated \Sit"u*a`ted\, a. [LL. situatus, from situare to place, fr. L. situs situation, site. See Site.] 1. Having a site, situation, or location; being in a relative position; permanently fixed; placed; located; as, a town situated, or situate, on a hill or on the seashore. [1913 Webster]
2. Placed; residing. [1913 Webster]
Pleasure situate in hill and dale. --Milton. [1913 Webster]
Note: Situate is now less used than situated, but both are well authorized. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Situate \Sit"u*ate\, v. t. To place. [R.] --Landor. [1913 Webster]