| Concept: | [Double or mutual change] Interchange. |
| Category: | 1. SIMPLE CHANGE |
| Synonyms: |
-adjectives
interchanged; reciprocal, mutual, commutative, interchangeable, intercurrent., substituted; vicarious, subdititious.
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| Concept: | Use. |
| Category: | 2. Subservience to ends; precursory measures |
| Synonyms: |
-adjectives
in use; used; well-worn, well-trodden., useful; subservient (instrumental).
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| Antonyms: | disuse, misuse |
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