Noah Webster's New International Dictionary of the English Language

1. (v. t.) To entreat for; to seek by earnest prayer; to ask for earnestly and humbly; to beg; as, to supplicate blessings on Christian efforts to spread the gospel.

2. (v. t.) To address in prayer; to entreat as a supplicant; as, to supplicate the Deity.

3. (v. i.) To make petition with earnestness and submission; to implore.