Is there more than one definition of natural selection?

Natural selection is the term for a process where offspring from parents show genetic based variation (physical, physiological and behavioural) and there is differential survival of progeny at each generation due to a feature that offers a survival advantage over another variation of that feature (alternative phenotypes) in other individuals. Environmental (biotic and abiotic) factors will "select" for features/individuals in a population that suit the prevailing conditions.