E'er is a poetic contraction meaning 'ever' or 'always.' As a noun in literary contexts, it evokes archaic or elevated diction. In pronunciation practice, it is typically realized as a short, unstressed /ɛːɚ/ (US) or /ɜː/ with a light ending, depending on the speaker’s dialect and elision, often merging vowels into a single syllable in flowing verse.
Full pronunciation guide