Long-term memory refers to the ability to retain and recollect information for an extended period. Synonyms for this term include permanent memory, enduring memory, sustained memory, and persistent memory. Other terms that suggest the retention of information over time include consistent memory, stable memory, and steady memory. Endurance memory is also a suitable option, as it suggests that the information is retained over a prolonged period despite various other changes occurring. Lastly, repetitive memory is another term that could be used, as it suggests that the information was internalized through continued reinforcement. Regardless of the term used, the ability to retain information over a long period is critical for effective learning and development.