1. Noun

   1.

   idea; notion; concept; conception

2. 2.

   sense (e.g. of duty)

3. Noun, Suru verb, Transitive verb

   3.

   resignation (to one's fate); acceptance; preparedness

Example sentences

• もう助からないものと観念した。

  I gave up all hope of survival.

• 下手に手を動かすと気付かれてしまうという強迫観念が俺を襲う。

  I was assailed by the stupid, but unshakeable, idea that if I was imprudent enough to move my hand I'd be noticed.