1. Something which has been studied or thought out in order to develop or to invent a project or some kind of tool, machine, or action: The excogitations of some inventors have resulted in many time-saving devices which make the lives of people more comfortable and advantageous, including automobiles, computers, phone systems, etc.
2. The careful contemplation or the creation of something in the mind in order to achieve a complete understanding of it: After spending many hours of excogitations regarding his future, Jeff finally decided to study biology and then to join Greenpeace to make the world a better place to live in!