| annul | (verb) cancel officially | Synonyms: countermand, lift, overturn, repeal, rescind, reverse, revoke, vacate |
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| (verb) declare invalid | Synonyms: avoid, invalidate, nullify, quash, void |
| annunciate | (verb) foreshadow or presage | Synonyms: announce, foretell, harbinger, herald |
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| cannulate | (verb) introduce a cannula or tube into | Synonyms: cannulise, cannulize, canulate, intubate |
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| cannulise | (verb) introduce a cannula or tube into | Synonyms: cannulate, cannulize, canulate, intubate |
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| cannulize | (verb) introduce a cannula or tube into | Synonyms: cannulate, cannulise, canulate, intubate |
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| superannuate | (verb) retire or become ineligible because of old age or infirmity | - |
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| (verb) become obsolete | - |
| (verb) declare to be obsolete | - |
| (verb) retire and pension (someone) because of age or physical inability | - |