the time from midnight to noon or sunrise to noon
the dawn
the beginning or an early period, e.g. of time or life
The morning and spring of your life are past — Henry David Thoreau
in the morning
during the morning
tomorrow morning
the morning after
the unpleasant aftereffects, esp a hangover, felt on the morning after a night of excessive drinking, etc, or the time when these unpleasant aftereffects often felt then are felt
[Middle English, from morn + -ing (as in evening)]