Unfamiliar words, places, and sundry other references get added to the list with a view toward richer cultural and conversational engagement.

Recently Erased Ignorance
Ignorance Explained
1 verklempt overcome with emotion
2 precipitously hastily and without careful consideration
3 panopticon a circular prison with cells arranged around a central well, from which prisoners could at all times be observed.
4 subsidence the gradual caving in or sinking of an area of land
5 nonpareil having no equal
6 obloquy strong public criticism or verbal abuse
7 fulsome characterized by abundance; generous in amount, extent, or spirit
8 acidly something incisive, biting, or sarcastic
9 louche disreputable or sordid in a rakish or appealing way
10 ducal of or relating to a duke or dukedom

The full list can be viewed here.

Definitions appearing on this page are generally either verbatim or derived from Merriam-Webster's College Dictionary, Tenth Edition, 1999 or its online counterpart.