EXCOGITATION
invention, innovation, excogitation, conception, design
(noun) the creation of something in the mind
excogitation
(noun) thinking something out with care in order to achieve complete understanding of it
Source: WordNet® 3.1
Etymology
Noun
excogitation (countable and uncountable, plural excogitations)
Careful thought or consideration.
Source: Wiktionary
Ex*cog`i*ta"tion, n. Etym: [L. excogitatio: cf. F. excogitation.]
Definition: The act of excogitating; a devising in the thoughts; invention;
contrivance.
Source: Webster’s Unabridged Dictionary 1913 Edition