Language differentiation refers to the task of children growing up exposed to two (2) or more languages to figure out that they are hearing two (2) different languages rather than one language that is some combination of both.
Language games is a term which according to Wittgenstein is the linguistic conventions that guide activities within a community.
Language input refers to the speech children hear. Language input is the "input" to the Language Acquisition Device. Please see Language Acquisition Device
Language perception refers to the ability to recognize sounds and differentiate among sound combinations before the meanings of these sounds are understood.
Language play refers to activities such as rhyming, using alliteration, and making puns that manipulate the sound of language.
Language production refers to the generation of language material by an individual. One of the first significant events is the naming of objects.
Language socialization refers to the process by which children learn the socially appropriate use of language in their communities and the process by which language socializes children to adopt the attitudes and behaviors of their communities.
Language transfer is a term in second-language acquisition that refers to the process in which the first language influences the acquisition of a subsequent language; influences of the native language on second language learning .