Meaning of signless in English:

signless

Pronunciation /ˈsʌɪnlɪs/

adjective

  • 1Without a sign; especially (of a building, road, etc.) unmarked by a signpost or notice.

  • 2 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.

Origin

Mid 17th century; earliest use found in Thomas Fuller (1607/8–1661), Church of England clergyman. From sign + -less.