What word does the raven continue to repeat why is this significant?

The Word "nevermore" is repeated by the raven in Edgar Allan Poe's poem. This repetition is significant as it serves as a constant reminder of the raven's ominous presence and adds to the eerie and melancholic atmosphere of the poem. The Word also reflects the narrator's despair and sense of hopelessness, as the raven seems to be delivering a message of finality and inevitability.