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1.
A Japanese term, meaning "I'm in love with you"
Aishiteru, Ami.
de Ami 16 avril 2004
 
2.
The Japanese word aishiteru, means i love you in English.
Guy: Aishiteru
Girl: Aishiteru too
de Amo0 25 janvier 2011
 
3.
It means I love you in japanese.
Ai shiteru, Kaoru-san.
de Rainy~ 5 mars 2010
 
4.
A Japanese phrase of "I love You".

More intimate though and is actually so strong married couples are hesitant to use the phrase.
Girl: "ai shiteru"
Boy: "Don't you think that is a little extreme. I mean we've only been dating two weeks."
de NAtwins 6 août 2014
 
5.
Although "aishiteru" is the Romanised form of the Japanese for "I love you", it's worth noting that the word isn't actually used very often in Japan.

Its most common usage by far is amongst weeaboos (see also wapanese) where you'll almost always see it spelled with the Roman alphabet like it is here.
Her: aishiteru~ :3
Me: please fuck off, I'm trying to play Xbox
de [PE]kawaii 4 février 2013