Other forms: mornings
The morning is the early part of the day, from waking until midday. This morning, in the morning, every morning.
The prepositions matter: in the morning for a general time, on Monday morning for a named day, and this morning with no preposition at all. Good morning is the greeting until noon. Note morning sickness, which despite the name happens at any hour; the morning after, meaning the consequences of the night before; and mourning, meaning grief, which sounds identical and catches everybody at least once.
1nounmorningThe early part of the day, before midday.
“She does her best work in the morning.”
morning is a part of the day.
Middle English morwening was built from morwen, morning, on the model of evening — which is why the two words rhyme in shape. The older word survives in morrow and tomorrow.
Middle English
morwenynge
English, today
morning
From Middle English morwenynge, from morwen + -ynge. by surface analysis, morn + -ing. See also morrow (Middle English morwe).
Etymology from Wiktionary, CC BY-SA