Definite zero anaphora is an anaphoric construction in which a referent is not expressed by a form but can be inferred from the context.
Other terms are "null anaphora" and "definite null instantiation (DNI)". Definite zero anaphora must be distinguished from indefinite zero anaphora, which exists in many languages but has not been widely studied (e.g. Did you buy potatoes? Yes, I bought Ø.)
zero anaphora (a.k.a. definite null instantiation, DNI, null anaphora) (CXN) = the absence of a referring phrase for a referent in a construction. Zero anaphora is frequently used when the referent is active. (Section 3.3.1)