Entry 1 sense Webster, 1913 Virgo /vẽrg'-ō/ · Vir·go · IPA /ˈvɝ.ɡoʊ/ 01 n. A sign of the zodiac which the sun enters about the 21st of August, marked thus [♍] in almanacs. 1. A sign of the zodiac which the sun enters about the 21st of August, marked thus [♍] in almanacs.(Astron.)