Ainoō (G134) means to praise, specifically directed toward God. In the Gospels, shepherds praise God after the birth of Jesus (Luke 2:20). The blind man healed praises God (Luke 18:43). Angels praise at the nativity. The word is deeply connected to responsive praise — people who have received grace breaking out in verbal glorification.
Ainoō is praise as response to redemption. In every instance in the Gospels, ainoō follows a mighty act of God — a healing, a divine announcement, a rescue. This pattern continues in Revelation: the heavenly creatures praise God not as ritual but as response to who he is and what he has done. Praise is the natural language of those who have seen God act.