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Kíli says to Tauriel “amrâlimê” […]
I believe the word consists of three parts “amrâl”, “im” and “ê”
“amrâl” – means “love”. It used the abstract construction aCCâC as seen in the Tolkien original khuzdul words such as “aglâb”. The radicals in amrâl, MRL are faintly reminiscent of the Quenya “melmë” (love) and “mírima” (very lovely), and of the Sindarin “meleth” (love), while also hinting at the latin “amorem” (love).
“im” – […] it seems clear this is a genitive marker, indicating “of”.
“ê” – is the first person possessive pronoun “my”, also use for “me”.
Putting all of this together we get “love-of-me”
So, as a result we get: “My Love”