memory

1. Origins, structure, and basic meaning

• Structure: 憶 has 16 strokes and the on-reading おく, used in 記憶 (きおく) and 追憶 (ついおく).
• Basic usage: 記憶 concerns remembered information or remembering it; 追憶 concerns recollection of past days.

2. Common pitfalls and similar expressions

• Remembered information and recollections of the past
  • 旅行の記憶が鮮明によみがえる means that vivid memories of a trip return. 道順を記憶していた explains remembering the route well enough to walk without a map.
  • 少年時代への追憶 means recollections of boyhood. 旅の日々を追憶する means to recall one's traveling days.