Absolutism: The position that within a particular school of though, all different perspectives are either absolutely true or absolutely false.
Empiricism: The scientific doctrine stating that all knowledge ultimately comes from sensory experience and observable evidence, rather than intuition or pre-conceived ideas.
Eternalism: The philosophical position that time is just another dimension, that future events already exist, and that all points in time are equally real.
Skepticism: The method of practicing doubt when regarding what is held as knowledge.
Eudaimonism: A system of ethics that evaluates actions in terms of their capacity to produce happiness.
Existentialism: The idea that all philosophical thought must begin with the experiences of the individual, and it is up to the individual to give meaning and authenticity to their own existence.
Free will: The ability of conscious agents to be free to make their own decisions, free of any social, moral or political constraints.
Hedonism: The ethical position that pleasure is the ultimate goal and greatest good, and should be the central aim of all decisions made.