I have used some words without knowing exactly what they meant but had gleaned how to use them. Later, I've found out more about them. Examples are 'candid meaning white' and 'halcyon meaning a kingfisher'.
A week ago I could have pronounced and spelled 'coruscate' but I didn't really know what it meant. So I looked it up, and now I know.
Are there any words you've learned later in life?
(We had an English teacher who used to say, "Look it up, girl.")