圆

circle / round / circular / spherical / (of the moon) full / unit of Chinese currency (yuan) / tactful / to make consistent and whole (the narrative of a dream or a lie)

person / employee / member

enclosure

to have a reunion

semicircle

circumference

semicircular

virtuous achievements come to their successful conclusion (idiom)

to buy the whole lot / to take everything remaining

protractor

oval / ellipse

oval / ellipsoidal

oval window between middle and inner ear

coaxial circular arc / concentric arc (in spherical geometry)

radiance emanating from the head / halo

the trigonometric functions

cyclostome (marine biology)

see 方枘圓鑿|方枘圆凿[fang1 rui4 yuan2 zao2]

Chinese customs gold unit, currency used in China between 1930 and 1948

without rules, nothing can be done (idiom, from Mencius); one must follow some rules

inflexible / unaccommodating

hexagon socket head cap screw

to counter (a stroke in fencing)