A mnemonic [ni-mon-ik] (the first ‘m’ is not pronounced) device, or memory device, is any learning technique that aids information retention or retrieval (remembering) in the human memory.
Mnemonics make use of elaborative encoding (connecting concepts you want to remember to preexisting knowledge visually, spatially, semantically or acoustically) and other retrieval cues as tools to encode any given information in a way that allows for efficient storage and retrieval. Mnemonics aid original information in becoming associated with something more accessible or meaningful—which, in turn, provides better retention of the information.
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The Daily Omnivore 