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retentive

retentive /rɪˈtɛntɪv/ adjective
retentive
/rɪˈtɛntɪv/
adjective
Britannica Dictionary definition of RETENTIVE
[more retentive; most retentive] formal
: having the ability to remember things easily or for a long time see also anal-retentive

— retentiveness

noun [noncount]