| incidental | 1. Small and relatively unimportant, minor. 2. Accompanying, but not a major part of something. 3. (to something) liable to occur because of something or in connection with something (said of risks, responsibilities) (18 Nov 1997) |
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| incidental colour | An obsolete term for a colour impression that remains after removal of the source. See: afterimage. (05 Mar 2000) |
| incidental learning | Learning without a direct attempt. Synonym: passive learning. (05 Mar 2000) |
| incidental parasite | A parasite that normally lives on a host other than its present host. (05 Mar 2000) |