悟性 is read as ごせい (gosei) and means wisdom.
ごせい
gosei
さとる
to attain enlightenment
さとり
comprehension
ごにゅう
entering enlightenment
さとりをひらく
to achieve enlightenment
ごどう
(the path of spiritual) enlightenment
さとりがはやい
being quick to understand
いせい
isomerism
さんせい
acidic
まんせい
chronic (illness)
いんせい
negative (result)
ほうしゃせい
radioactive
だせい
force of habit