1) Conveying an invitation 2) Inviting 3) Liturgy of the Hours 4) Serving to invite 1) Inviting 
The Invitatory is the psalm used to start Nocturns in the Liturgy of the Hours, the Catholic Church`s Divine Office. It is usually Psalm 94(95), which begins Venite exsultemus in Latin. After the reform of the Liturgy of the Hours following the Second Vatican Council, the Invitatory is said either before the Office of Readings or Lauds, whichever....
psalm or anthem sung before prayer during church service
• (n.) That which invites; specifically, the invitatory psalm, or a part of it used in worship. • (a.) Using or containing invitations.
In·vi'ta·to·ry adjective [ Latin invitatorius : confer French invitatoire .] Using or containing invitations. « The 'Venite' [ Psalm xcv.], which is also called the invitatory psalm.» Hook. 
[adj] - conveying an invitation
adjective conveying an invitation; `a brief invitatory note`
serving to invite; conveying an invitation.