Entry 3 senses · 3 variants Webster, 1913 Unco · Un·co · IPA a. adv. n. 01 a. Unknown; strange, or foreign; unusual, or surprising; distant in manner; reserved. 1. Unknown; strange, or foreign; unusual, or surprising; distant in manner; reserved.[Scot.] 02 adv. In a high degree; to a great extent; greatly; very. 1. In a high degree; to a great extent; greatly; very.[Prov. Eng. & Scot.] 03 n. A strange thing or person. 1. A strange thing or person.[Scot.]