Dictionary.com: 's Today's Word is: sentient
sentient \SEN-shee-uhnt; -tee-; -shuhnt\, adjective:
1. Capable of perceiving by the senses; conscious.
2. Experiencing sensation or feeling.
I can remember very vividly the first time I became aware of my existence; how for the first time I realized that I was a sentient human being in a perceptible world.
-- Lord Berners, First Childhood