Final answer:
The LAD refers to the language acquisition device, a theoretical construct proposed by Chomsky, indicating an innate human capacity for language learning.
Step-by-step explanation:
The acronym LAD stands for language acquisition device, which is a theoretical construct in the field of cognitive psychology that suggests humans have an innate biological mechanism or cognitive capacity for acquiring language. This concept was primarily proposed by Noam Chomsky to explain the ease and uniformity with which children learn languages across various cultures. Chomsky's LAD posits that language learning is not solely dependent on external reinforcement or stimuli but is instead facilitated by an inborn predisposition. This ability is particularly potent during a critical period in early childhood, when language acquisition occurs most naturally and efficiently.