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sedentary (adj.) sitting, settled (The sedentary cat did little but loll in the sun.)

semaphore (n.) a visual signal (Anne and Diana communicated with a semaphore involving candles and window shades.)

seminal (adj.) original, important, creating a field (Stephen Greenblatt’s essays on Shakespeare proved to be seminal, because they initiated the critical school of New Historicism.)

sensual (adj.) involving sensory gratification, usually related to sex (With a coy smile, the guest on the blind-date show announced that he considered himself a very sensual person.)

sensuous (adj.) involving sensory gratification (Paul found drinking Coke, with all the little bubbles bursting on his tongue, a very sensuous experience.)

serendipity (n.) luck, finding good things without looking for them (In an amazing bit of serendipity, penniless Paula found a $20 bill in the subway station.)

serene (adj.) calm, untroubled (Louise stood in front of the Mona Lisa, puzzling over the famous woman’s serene smile.)

servile (adj.) subservient (The servile porter crept around the hotel lobby, bowing and quaking before the guests.)