Words I Frequently Forget the Meaning Of

I look them up ('ah yes i knew that') only to have them vanish from my memory once more. These are the doozies I can think of at the moment...
  1. Ergo
    Therefore
  2. Nadir
    Lowest point
  3. Nonplussed
    Means different things across the pond
  4. Aphorism
    A concise witty saying containing a truth. An adage
  5. Anathema
    Something or someone that one vehemently dislikes
  6. Ontological
    I have an MA but the hell if I ever remember this one well enough to explain it to others
  7. Epistemology
    I have two master's, one in health education and one in nursing, yet I struggle with epistemology (and ontology).