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From our dictionary:
Pronunciation: (sed'n-ter"E), [key]
1. characterized by or requiring a sitting posture: a sedentary occupation.
2. accustomed to sit or rest a great deal or to take little exercise.
3. Chiefly Zool.
a. abiding in one place; not migratory.
b. pertaining to animals that move about little or are permanently attached to something, as a barnacle.