noun

• (uncountable) The act of instructing, teaching, or providing with information or knowledge.
• (countable) An instance of the information or knowledge so furnished.
• (countable) An order or command.
• (in the plural) A set of directions provided by a manufacturer for the users of a product or service.
• (law, in the plural) The directions given by a client to their lawyer in relation to a particular legal matter, which govern the purpose and scope of their work.
• (computing) A single operation of a processor defined by an instruction set architecture.