| ASSUMPTIONS | • assumptions n. Plural of assumption. • ASSUMPTION n. the taking up of a person into heaven. |
| ISOTROPISMS | • ISOTROPISM n. isotropy, also ISOTROPY. |
| POSITIVISMS | • positivisms n. Plural of positivism. • POSITIVISM n. the doctrine that that which is not observable is not knowable. |
| POSTMASTERS | • postmasters n. Plural of postmaster. • POSTMASTER n. one who has charge of a station for the accommodation of travelers; one who supplies post horses. |
| PRESTISSIMO | • prestissimo adj. (Music) Extremely fast, the fastest possible tempo. • prestissimo adv. (Chiefly music) Very quickly. • PRESTISSIMO adj. (Italian) as quickly as possible. |
| PROSTATISMS | • prostatisms n. Plural of prostatism. • PROSTATISM n. an illness or disorder associated with enlargement of the prostate. |
| PSALMODISTS | • psalmodists n. Plural of psalmodist. • PSALMODIST n. a singer of psalms. |
| SEMIPOSTALS | • semipostals n. Plural of semipostal. • SEMIPOSTAL n. an issue of postage stamps the proceeds of which are donated to charity. |
| SPASMODISTS | • spasmodists n. Plural of spasmodist. • SPASMODIST n. a person whose work is spasmodic. |
| SUPERSTORMS | • superstorms n. Plural of superstorm. • SUPERSTORM n. an extremely powerful storm that causes widespread devastation. |
| SYMPHONISTS | • symphonists n. Plural of symphonist. • SYMPHONIST n. a composer or (rarely) performer of symphonies. |
| SYMPOSIASTS | • symposiasts n. Plural of symposiast. • SYMPOSIAST n. a participant at a conference. |
| SYMPTOMLESS | • symptomless adj. Lacking symptoms. • SYMPTOMLESS adj. without symptoms. |