idea, notion

(いしき) Consciousness, as in “I lost consciousness,” but also as in, “She’s environmentally conscious.” or “I hate those socially-conscious rock stars like Bono. Bono should perish.”   $$$
 
(かんねん) To have a concept of something. “Babies have no concept of right and wrong.” “My boyfriend has no concept of hygiene.”
 
(げんしょう) Phenomenon.