month-longadj.adv.
/ˈmʌnθlɒŋ/, /ˌmʌnθˈlɒŋ/, U.S. /ˈmənθˈlɔŋ/, /ˈmənθˈlɑŋ/ A. adj.
That lasts or lasted a month.
ΘΚΠ
the world > time > period > a month or calendar month > [adjective] > lasting a month
monthish1540
monthly1589
menstruous1652
month-long1843
1843 E. B. Pusey Serm. Holy Eucharist 28 All but a month-long fast from our ‘daily Bread’.
1896 Amer. Hist. Rev. 1 527 The month-long reign of Pius III. making but a prefatory episode in the third [book].
1931 H. Norden Wanderer in Indo-China iii. 55 Tet is the month-long New Year's festival which begins a month later than the Occidental new year.
1977 Chicago Tribune 2 Oct. ii. 31/2 Southeast Missouri State University Saturday night began a monthlong exhibit of ancient Egyptian artifacts.
2001 Big Issue 10 Apr. 4/1 Shareholders..have been warned that they will be visited by animal welfare campaigners as part of a month-long ‘tour’.
B. adv.
Chiefly poetic. For the duration of a month.
ΘΚΠ
the world > time > period > a month or calendar month > [adverb] > lasting a month
month-long1887
1887 W. Morris tr. Homer Odyssey I. x. 168 And me month-long there he cherished.
1887 W. Morris tr. Homer Odyssey I. xii. 225 And month-long no breeze at all Rose up o'er the sea.
This entry has been updated (OED Third Edition, December 2002; most recently modified version published online March 2022).
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adj.adv.1843