Learner's definition of MORNING
1 a : the early part of the day: the time of day from sunrise until noon
She liked to get things done early in the morning.
I worked in the yard for part of the morning.
I saw him this morning, and I'll be meeting with him again tomorrow morning.
We have a meeting scheduled for 10 o'clock Wednesday morning.
On Sunday mornings I like to relax and read the newspaper.
She arrived on the morning of March 18.
the morning after a storm
that night and the next/following morning = that night and the morning after
I'll talk to you again in the morning. [=I'll talk to you again early tomorrow]
— often used before another noun
It was early/late morning when I woke.
We sat around drinking coffee all morning.
We won't find out until morning.
(literary) Morning has broken. [=the sun has risen; it is dawn]
b [noncount] : the part of the day between midnight and noon
the morning sun/light
my morning (cup of) coffee [=the coffee I drink every morning]
My brother is a night owl/person, but I'm a morning person. [=a person who likes the early part of the day; a person who has the most energy in the morning]
2 — used informally to say hello to someone in the morning
morning, noon, and night
: during all times of the day: all the time
The system is operating morning, noon, and night.
We've been working morning, noon, and night [=many hours each day] to get the project finished on time.