Meaning

• To humble oneself before (another) in making a request; to beg or beseech.

• To entreat for; to ask for earnestly and humbly.

  "to supplicate blessings on Christian efforts to spread the gospel"

• To address in prayer; to entreat as a supplicant.

  "to supplicate the Deity"

• (Oxford University) To request that an academic degree is awarded at a ceremony.