What is the meaning of ?

the middle, medium

an average, neither good nor poor mark

the second volume of a three-volume set

during..., being in the process of doing...

during, in the course of, throughout

all over, everywhere

Short for 紅中 (honchun): a red dragon tile

a (yaku, winning hand combination) with a meld of red dragon tiles, worth 1 (han, double)

a surname

a female given name

a surname

Short for ()() (Jungguk, China).

in; at; amid

Source: wiktionary.org