Capacity of mind, especially to understand principles, truths, facts or meanings, acquire knowledge, and apply it to practice; the ability to comprehend and learn.
The quality of making use or having made use of such capacities: depth of understanding, mental quickness.
Information, often secret, about an enemy or about hostile activities.
A political or military department, agency or unit designed to gather information, usually secret, about the enemy or about hostile activities.
An entity that has such capacities.
A system of training to improve the memory.
A memory card game in which a pack of cards is spread out face-down and players try to turn up pairs with the same symbol.