Definition of logics:
(n) :
(uncountable) A method of human thought that involves thinking in a linear, step-by-step manner about how a problem can be solved. Logic is the basis of many principles including the scientific method.
(n) :
(philosophy, logic) The study of the principles and criteria of valid inference and demonstration.
(n) :
(uncountable, mathematics) The mathematical study of relationships between rigorously defined concepts and of mathematical proof of statements.
(adj) :
logical
(n) :
(countable, mathematics) A formal or informal language together with a deductive system or a model-theoretic semantics.
(n) :
(countable) Any system of thought, whether rigorous and productive or not, especially one associated with a particular person.