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word-forming element used in making adjectives from nouns or adjectives (and sometimes verbs) and meaning "tending to; causing; to a considerable degree," from Old English -sum, identical with som (see some). Cf. Old Frisian -sum, German -sam, Old Norse -samr; also related to same.
suffix added to numerals meaning "a group of (that number)," e.g. twosome, from pronoun use of Old English sum "some" (see some). Originally a separate word used with the genitive plural (e.g. sixa sum "six-some"); the inflection disappeared in Middle English and the pronoun was absorbed. Use of some with a number meaning "approximately" also was in Old English.
word-forming element meaning "the body," Modern Latin, from Greek soma "the body" (see somato-).