Aloha in the Hawaiian language means affection, love, compassion, mercy, goodbye, and hello, among other sentiments of a similar nature. It is used especially in Hawai'i as a greeting meaning hello and goodbye. Variations occur based on circumstances when used as a salutation. Aloha kakahiaka is the phrase for good morning. Aloha auinala is the phrase for good afternoon. Aloha ahiahi is the phrase for good evening. Aloha kakou is a common form of welcome to all.
It is also the state nickname of Hawaii, being the "Aloha State".
the source: http://en.wikipedia.org/wiki/Aloha
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