Acquisition refers to the process by which people notice and pay attention to information in the environment; because people cannot perceive everything that is happening around them, they acquire only a subset of the information available in the environment.
Acquisition is defined in social psychology as the process by which people notice and pay attention to information in the environment; people cannot perceive everything that is happening around them, so they acquire only a subset of the information available in the environment.
Other /More definition:
Acquisition refers to the period in conditioning during which a response is reinforced.
In conditioning theories, Acquisition is sometimes used interchangeably with the term learning. It might be used to signify the formation of associations among stimuli or between responses and their consequences