1. To nullify, overturn, or render void a legal conviction or guilty verdict through legal proceedings
The appeals court decided to invalidate the conviction due to insufficient evidence.
O tribunal de apelação decidiu anular a condenação devido a provas insuficientes.
2. To set aside a conviction based on procedural errors, new evidence, or violation of constitutional rights
The DNA evidence helped invalidate the conviction of the wrongly imprisoned man.
A prova de DNA ajudou a anular a condenação do homem encarcerado injustamente.