The process, usually completed over several hours but which may continue for years, that fixes information in long-term memory is called:

Consolidation is the process, often taking hours but sometimes years, that stabilises and fixes information in long-term memory.

Suppression is a conscious effort to push unwanted thoughts out of awareness, not a memory-fixing process.

Contextual memory refers to remembering the setting in which learning occurred, not the stabilising process itself.

Retrospective intervention is not a standard memory term for long-term storage.

Consolidation depends on the hippocampus early and gradually transfers memories to the neocortex.

Sleep, especially slow-wave and REM sleep, strengthens memory consolidation.