Entry 2 senses · 2 variants Webster, 1913 Invitatory · In·vi·ta·to·ry · IPA a. n. 01 a. Using or containing invitations. 1. Using or containing invitations. “The “Venite” [Psalm xcv.], which is also called the invitatory psalm.” — Hook. 02 n. That which invites; specifically, the invitatory psalm, or a part of it used in worship. pl. Invitatories ((#)) 1. That which invites; specifically, the invitatory psalm, or a part of it used in worship.