conception

(noun) an abstract or general idea inferred or derived from specific instances. Synonyms: concept, construct.

(noun) the act of becoming pregnant; fertilization of an ovum by a spermatozoon.

(noun) the event that occurred at the beginning of something. Synonyms: creation. Example: "From its creation the plan was doomed to failure."

(noun) the creation of something in the mind. Synonyms: invention, innovation, excogitation, design.