Adjective
The word is derived from fit
The unrestricted competition so commonly advocated does not leave us the survival of the fittest. The unscrupulous succeed best in accumulating wealth. Rutherford B. Hayes
Whoever claims that economic competition represents survival of the fittest in the sense of the law of the jungle, provides the clearest possible evidence of his lack of knowledge of economics. George Reisman
Only the fittest of the fittest shall survive, stay alive. Bob Marley
Each age has deemed the new-born year the fittest time for festal cheer. Walter Scott
The expression often used by Mr. Herbert Spencer of the Survival of the Fittest is more accurate, and is sometimes equally convenient. Charles Darwin
I have always striven to fix beauty in wood, stone, glass or pottery, in oil or watercolor by using whatever seemed fittest for the expression of beauty, that has been my creed. Louis Comfort Tiffany