"Whilom" derives from Old English "hwilum," meaning "at times" or "formerly," and appears frequently in medieval and Early Modern English poetry to establish a nostalgic or historical tone. Poets like Chaucer and Spenser employed "whilom" to frame their narratives in a distant past, creating an atmosphere of legend and romance. The term serves both temporal and tonal functions, signaling to readers that the events described belong to an earlier, often idealized era. Its usage evokes the oral tradition of storytelling, where tales began with formulas like "whilom there was" to transport audiences to bygone times. The word contributes to poetic meter and lends an air of antiquity that enhances themes of memory, loss, and the passage of time.

“Whilom” means “formerly” or “once upon a time,” marking temporal distance in narrative or reflective poetry. It lends a sense of nostalgia or legend, signalling that what follows belongs to an earlier age. Recognising its function helps interpret tone shifts toward the mythical or historical.