Grice

Grice:


Paul Grice, was a British philosopher of language, who spent the final two decades of his career in the United States.
Grice's work on the nature of meaning has influenced the philosophical study of semantics. His theory of implicature is among the most important and influential contributions to contemporary pragmatics.
Grice's most influential contribution to philosophy and linguistics is his theory of implicature, which he first began developing in his 1961,‘The Causal Theory of Perception', but which is most fully explored in his 1967 William James Lectures on "Logic and Conversation".
The basic idea here is that the meaning of a word or sentence results from a regularity in what speakers use the word or sentence to mean. Grice would give a much more detailed theory of timeless meaning in his sixth Logic and Conversation lecture.

Grices Maxims discovered and created four maxims:

Quantity - Use of appropriate amount of detail when speaking to someone with right amount of conversational linguistics. 
Quality- Being truthful and speaking only the truth with no reason to knowingly mislead, meaning no lying and speaking truthful at all times during a conversation.
Relevance- Keep what is being discussed relevant and according to the topic of conversation. No need of changing the subject mid-way through conversation.
Manner- Avoid vagueness when talking and being full of enthusiasm and energy.