The state of being drowsy or inattentive; dullness.
[From oscitant, yawning, from Latin ōscitāns, ōscitant-, present participle of ōscitāre, to yawn : ōs, mouth; see ōs- in Indo-European roots + citāre, to move; see kei-2 in Indo-European roots.] os'ci·tant adj.