オンプレミス is in daijs and nipp, etc., but プレミス by 
itself is not in eij or any of the dics on 
yahoo/weblio/gg5/goo. There's a bunch of hits on Twitter 
but I think it's used as an abbreviation of プレイミス 
which seems to mean "make a mistake in a video game"
(one example: "艦これアーケード初めてやったけど結構難しかっ
た。自分でキャラを動かして、判断しないといけないし、プレミスし
たら一発で持っていかれる。でも凄く楽しかった！またやりに行こ
う!")
(not sure if this usage is common enough to record)
_
I do find a bunch of real web and google book hits 
though, so I think we might as well accept it.

Thank you for the submission, Mangesh.

@@ -4,3 +3,0 @@
-<k_ele>
-<keb>プレミス</keb>
-</k_ele>
@@ -12 +9 @@
-<gloss>Premise</gloss>
+<gloss>premise</gloss>

お客様のプレミス: Customer's premise