Spinoza Baruch; Stael-Holstein Anne Louise Germaine Necker Baronne de; standard form; Stanton Elizabeth Cady; statement; statement constant; statement form; statement variable; Stevenson Charles Leslie; Stewart Dugald; stipulative definition; stoicism; Strawson Peter F.; structuralism; Suarez Francisco; subalternation; subjective; sublime; sub specie aeternitatis; substance; sufficient condition; sui generis; summum bonum; supererogatory; supervenient; syllogism; symbolic logic; symbols - logical; syncategorematic; synderesis; synonymous; syntactics; synthesis;