Plainly
look up a word, understand it — no rabbit hole
diagnosis
noundy-ag-NOH-sis
meaning in plain English
The name a doctor gives your illness after figuring out what is wrong.
Think doctor’s answer — the diagnosis names what is making you sick.
for example
The doctor’s diagnosis was strep throat, so she prescribed antibiotics.
A diagnosis is the answer after tests. Why did she get antibiotics? Because the diagnosis was strep throat — the doctor named the illness and knew how to treat it.