verb, -grat⋅ed, -grat⋅ing.| 1. | to separate into parts or lose intactness or solidness; break up; deteriorate: The old book is gradually disintegrating with age. |
| 2. | Physics.
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| 3. | to reduce to particles, fragments, or parts; break up or destroy the cohesion of: Rocks are disintegrated by frost and rain. |