Semantics is the branch of linguistics and philosophy concerned with meaning, understanding how language represents and conveys meaning to its users. It involves the study of how words, phrases, and sentences are used to convey meaning in context and how listeners interpret these meanings.
Indexicality refers to the phenomenon where certain expressions or signs point to a specific context or situation, deriving their meaning from the circumstances in which they are used. It is a crucial concept in linguistics and semiotics, highlighting how language and symbols are inherently tied to the context of their usage to convey meaning.
The concept of 'Meaning as use' suggests that the meaning of a word is fundamentally tied to how it is used in language, rather than being an inherent property or a fixed reference to an object. This perspective shifts the focus from seeking definitions to observing the practical and varied contexts in which language operates.