Definitions from Wiktionary ( )

▸ noun:  (chiefly uncountable) 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 ability to process sentient experience to generate true beliefs with a justified degree of confidence.
▸ noun:  (chiefly uncountable) The quality of making use or having made use of such capacities: depth of understanding, mental quickness.
▸ noun:  (countable) An entity that has such capacities.
▸ noun:  (chiefly uncountable) Information, often secret, about an enemy or about hostile activities.
▸ noun:  (countable) A political or military department, agency or unit designed to gather information, usually secret, about the enemy or about hostile activities.
▸ noun:  (dated) Acquaintance; intercourse; familiarity.

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