Noun. Early 19th century.
A summary, a conspectus; an insight, a revealing glimpse.
Chambers 20th Century Dictionary also defines aperçu as 'an immediate intuitive insight'. I like it. I'd like to have one one day.
Oh ... and if you want to sound really classy, try to sound French as you say it; it's pronounced ah-peh-soo. Nothing would quite discredit an aperçu as it sounding like a sneeze when it's pronounced.