機制 is read as きせい (kisei) and means mechanism.
きせい
kisei
ぼうえいきせい
defense mechanism
てきおうきせい
adjustment mechanism
ぜろよくせいきのう
zero suppression function
きかい
chance
きかん
engine
きのう
function
きこう
mechanism
きちょう
captain (of an aircraft)
きたい
fuselage
きかんしゃ
locomotive
きどう
maneuver (usu. of military force)
きうん
opportunity