Final answer:
Gender cognition refers to the acquisition of complex thoughts and behaviors that accompany being male or female by the age of five.
Step-by-step explanation:
The best-known term for the acquisition of complex thoughts and behaviors that accompany being male or female by the age of five is gender cognition.
Gender cognition refers to the understanding and awareness of gender roles and expectations.
Children learn these roles through socialization, where they observe and learn from the people and society around them.