ac·cliv·i·ty 
(ə-klĭvĭ-tē)
(ə-klĭvĭ-tē)n. pl. ac·cliv·i·ties
An upward slope, as of a hill.
[Latin acclīvitās, from acclīvis, uphill : ad-, ad- + clīvus, slope; see klei- in the Appendix of Indo-European roots.]
ac·clivi·tous (-ĭ-təs) adj.