العالم
كلمة (عالم) في اللغة اسم فاعل من الفعل (عَلِمَ يَعلَمُ) والعلم...
Any word or deed said or done when communicating with others in order to show them honor and respect.
"Tahiyyah" (greeting) is one of the ethics that are to be observed when people meet. Greetings differ from one people to another given their different customs and religions. The Islamic greeting is: "Assalāmu ‘alaykum wa rahmatullahi wa barakātuh." (May the peace and blessings of Allah be upon you). Its shortest form is: "Assalāmu ‘alaykum". (Peace be with you)
"Tahiyyah": invocation of "hayah" (life) for someone. It also means kingdom. So, "at-tahiyyātu lillah" (greetings are due to Allah) means: to Allah belong eternity and dominion. It also refers to any word or deed said or done upon meeting between people, by way of honor. Other meanings: veneration, honoring.