One of the mysteries of the English language finally explained.
1Without a sign; especially (of a building, road, etc.) unmarked by a signpost or notice.
2Chiefly literary. That makes no sign or movement; motionless.
3Mathematics. Of a number: not distinguished as positive or negative; written without a (plus or minus) sign.
Mid 17th century; earliest use found in Thomas Fuller (1607/8–1661), Church of England clergyman. From sign + -less.
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