Reuptake is the process where a nerve cell takes back a neurotransmitter it has released, which ends that signal.
The source term list called this recapture, a word that appears in texts translated from French. In English, the usual word is reuptake. It is unrelated to memory.
Reuptake matters for ADHD medication. Methylphenidate works mainly by blocking the reuptake of dopamine and noradrenaline, so more of them stay active between nerve cells for longer. Atomoxetine blocks the reuptake of noradrenaline. Many antidepressants block the reuptake of serotonin, which is where the name SSRI, selective serotonin reuptake inhibitor, comes from.
You don't need to know any of this to have an assessment. It helps if you want to understand why different ADHD medicines feel different.