Printer-friendly version. The Language Acquisition Device, or LAD, is part of Chomsky's acquisition hypothesis. The LAD is a system of principles that children are born with that helps them learn language, and accounts for the order in which children learn structures, and the mistakes they make as they learn.rinter-friendly version. The Language Acquisition Device, or LAD, is part of Chomsky's acquisition hypothesis. The LAD is a system of principles that children are born with that helps them learn language, and accounts for the order in which children learn structures, and the mistakes they make as they learn.