"Freud had said that when you begin to ask about 'the meaning of life' you are already sick." -Soul Survivor by Philip Yancey

According to the American Heritage Dictionary, the definition of meaning is something that is signified; something that one wishes to convey; intent, purpose. One of the definitions of life is the interval between the birth or inception of an organism and its death. Combining the two definitions the meaning of life would be intent or purpose that one desires to convey during the interval between one's birth and death.