Nolo's Plain-English Law Dictionary

Competent

1) Able to act in the circumstances, including the ability to perform a job or occupation, or to reason or make decisions. 2) In wills, trusts, and contracts, sufficiently mentally able to understand and execute a document. 3) In criminal law, sufficiently mentally able to stand trial or testify. 4) In evidence, relevant and legally admissible.
NOLO-web1:DRU1.6.12.2.20161011.41205