| Verb | 1. | invalidate - declare invalid; "The contract was annulled"; "void a plea"strike down, cancel - declare null and void; make ineffective; "Cancel the election results"; "strike down a law" break - invalidate by judicial action; "The will was broken" stet - printing: cancel, as of a correction or deletion | |
| 2. | invalidate - of cheques or tickets | |
| 3. | invalidate - show to be invalidvalidate - prove valid; show or confirm the validity of something | |
| 4. | invalidate - take away the legal force of or render ineffective; "invalidateas a contract"alter, change, modify - cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue" validate - make valid or confirm the validity of; "validate a ticket" | |