The crossword solutions for the term 'Eternally, in Poesy' are EER, which stands for Everlasting Rhyme. This is a poetic device used to create a sense of continuity and timelessness in a poem. It is achieved by repeating the same words or phrases at the end of each line or stanza. This technique has been used by many poets throughout history, including William Shakespeare, John Milton, and Robert Frost.