words to define

I like finding words of which I've never heard and for which I cannot
extrapolate the meaning from context.

I found three such words during the last couple of months.

coeval
adj. Originating or existing during the same period; lasting
through the same era.
n. One of the same era or period; a contemporary.

apercus
n. pl. 1. A discerning perception; an insight. 2. A short outline
or summary; a synopsis.

ergolated - this one I couldn't find at dictionary.com and haven't had
a chance to find an unabridged paper dictionary. Anyone?