/fɪkˈseɪʃn/
fix·ation
BrE /fɪkˈseɪʃn/
NAmE /fɪkˈseɪʃn/
[C]
a very strong interest in sb/sth, that is not normal or natural
a mother fixation
~ with/on sb/sth
He’s got this fixation with cleanliness.
[U] (specialist)
the process of a gas becoming solid
nitrogen fixation