diachronic or ''' Historical Linguistics ''', the study of how Language s and language families change over time. Opposed to ''synchronic'' or '' Descriptive Linguistics '', which studies a language at a specific point in time.
diachronic distinction or '''diachronic contrast''', between two entities that existed in different epochs, e.g. between the archaic English verbal Suffixes ''-eth'' and the modern ones ''-s''/''-es''. Opposed to a ''synchronic distinction'', between two co-exisiting entities, e.g. between the English Pronouns ''he'' and ''she''.
diachronic process, in modern Philosophy Of Mind , a process that occurs over a long period of time.
