Morn is the early part of the day, in poetic use. The dewy morn, till morn, on a summer morn.
Nobody says it in ordinary speech: it survives in poetry, hymns and deliberate archaism, chosen for being one syllable where morning is two. In Scots and northern English, the morn means tomorrow, which is a live and quite different use. Note morrow, which is the same family; and that good morning is a shortening of a longer greeting that has left morn behind.
1nounmornThe early part of the day, in poetic use.
“At break of morn, the shepherd led his flock into the hills.”
morn is a time of day.
Old English morgen gives both morn and morrow, which split into two words. The German Morgen still means both morning and tomorrow, as the Scots the morn does.
Middle English
morn
English, today
morn
Built from
From Middle English morn. From Middle English morn, morwen, from Old English morgen, from Proto-West Germanic morgan, morgin, from Proto-Germanic murganaz, murginaz, from Proto-Indo-European mr̥kéno, mr̥kóno, from Proto-Indo-European mr̥Hko, from mer- (“to shimmer, glisten”). See also West Frisian moarn, Low German Morgen, Dutch morgen, German Morgen, Danish morgen, Norwegian morgon; also Lithuanian mérkti (“to blink, twinkle”), Sanskrit मरी॑चि (“ray of light”), Greek μέρα (“morning”). a doublet of morrow and morgen. See also morning.
Etymology from Wiktionary, CC BY-SA