μεσόω, -ῶ (< μέσός), [in LXX: μεσούσης τ. νυκός, Exo.12:29 (חֵצִי), etc. ;] to be in the middle, esp. of time: τ. ἑορτῆς μεσούσης, in the middle of the feast, Jhn.7:14.† (AS)
Thayer:
1) to be in the middle, be midway
μεσόω
mesoō
mes-o'-o
From G3319; to form the middle, that is, (in point of time), to behalfway over
μέσος
mesos
mes'-os
From G3326; middle (as adjective or [neuter] noun)
KJV Usage: among, X before them, between, + forth, mid [-day, -night], midst, way.
G3314 μεσημβρίαμεσημβρία
mesēmbria
mes-ame-bree'-ah
From G3319 and G2250; midday; by implication the south
KJV Usage: noon, south.
G3316 μεσίτηςμεσίτης
mesitēs
mes-ee'-tace
From G3319; a gobetween, that is, (simply) an internunciator, or (by implication) a reconciler (intercessor)
KJV Usage: mediator.
G3317 μεσονύκτιονμεσονύκτιον
mesonuktion
mes-on-ook'-tee-on
Neuter of a compound of G3319 and G3571; midnight (especially as a watch)
KJV Usage: midnight.
G3318 ΜεσοποταμίαΜεσοποταμία
Mesopotamia
mes-op-ot-am-ee'-ah
From G3319 and G4215; Mesopotamia (as lying between the Euphrates and the Tigris; compare [H763]), a region of Asia
KJV Usage: Mesopotamia.
G3320 μεσότοιχονμεσότοιχον
mesotoichon
mes-ot'-oy-khon
From G3319 and G5109; a partition (figuratively)
KJV Usage: middle wall.
G3321 μεσουράνημαμεσουράνημα
mesouranēma
mes-oo-ran'-ay-mah
From a presumed compound of G3319 and G3772; mid-sky