I. ˌō-vər-ˈnīt adverb
Date: 14th century
1.
a. : on the evening before
b. : during the night
stayed away overnight
2. : very quickly or suddenly
became famous overnight
II. adjective
Date: 1824
1. : of, lasting, or staying the night
2. : sudden , rapid
an overnight sensation
3. : traveling during the night
an overnight train
4.
a. : accomplished by a mail service within one day's time
overnight delivery
b. : delivered within one day's time
overnight mail
III. ˈō-vər-ˌnīt, ˌō-vər-ˈ verb
Date: 1891
intransitive verb
: to stay overnight
transitive verb
: to send (as a package or letter) by a mail service for delivery within one day's time
IV. ˈō-vər-ˌnīt noun
Date: 1959
: an overnight stay