Pronunciation: (un-märkt'), [key]
1. not marked.
a. characterized by the absence of a distinctive phonological feature, as (p), which, in contrast to (b), lacks the distinctive feature of voicing.
b. characterized by the absence of a grammatical marker, as the singular in English in contrast to the plural, which is typically marked by an -s ending.
c. neutral with regard to an element of meaning specified by a semantically related item.
d. occurring more typically than an alternative form. Cf. marked (def. 4).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.