1) Semantics 
In linguistics, deixis (s) refers to words and phrases that cannot be fully understood without additional contextual information. Words are deictic if their semantic meaning is fixed but their denotational meaning varies depending on time and/or place. Words or phrases that require contextual information to convey any meaning – for example, Engl...
relating to time and place of a linguistic utterance
[n] - the function of pointing or specifying from the perspective of a participant in an act of speech or writing
noun the function of pointing or specifying from the perspective of a participant in an act of speech or writing; aspects of a communication whose interpretation depends on knowledge of the context in which the communication occurs
the operation or function of deictic elements.