vesper UK /ˈvɛspə/US /ˈvɛspɚ/noun 4adjective 1forms 1 noun4 •(literary) The evening.In mist or cloud, on mast or shroud, / It perch'd for vespers nine; Whiles all the night, through fog-smoke white, / Glimmered the white Moon-shine. — 1797 •A vesper martini. •The bell that summons worshippers to vespers; the vesper-bell. •A vesper bat.Almost all vespers are insect catchers. adjective1 •(literary) Evening.On Sumter’s rampart, that sweet eve, / I heard the vesper bugle play […] — 1908 formsvespers