Final answer:
A legally competent party is someone who has the legal and mental capacity to enter into a contract.
Step-by-step explanation:
The definition of a legally competent party is someone who has the legal and mental capacity to enter into a contract. Although children are not able to give permission on their own, parents can give consent on their behalf. Childhood is defined legally as the time between birth and adulthood (majority), or the era of minority. Mature age varies depending on context and goal. For instance, in the US, if you are 18 years old and want to serve in the military, you are still considered a minor if you want to purchase alcohol.