Having the necessary ability, knowledge, or skill to do something successfully. She is a competent engineer who consistently delivers high-quality work.
Having the legal authority or jurisdiction to deal with a particular matter. The court is competent to hear appeals on environmental issues.
Biology: (of a cell, tissue, or organism) able to take up genetic material, be fertilized, or respond to a specific stimulus. Competent bacterial cells can efficiently incorporate plasmid DNA during transformation.