the GNU version of the Collaborative International Dictionary of English
n. Lack of permanence.
The Century Dictionary and Cyclopedia
n. Want of permanence or continued duration.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the property of not existing for indefinitely long durations
Word Usage
"But even for those who aren't particularly attached to plastic discs (or liner notes, or cover art, or lyric sheets), the impermanence is still problematic."