What Does Konnichiwa Mean in Japanese?

If you want to greet someone in Japanese by saying “good afternoon” or “good day,” the word you want to use is Konnichiwa.

Konnichiwa is actually a shortened version of a full greeting. Over time, a more slang version of the term evolved in the Japanese language.
“Konnichiwa” was once the beginning of a sentence that went, “konnichi wa gokiken ikaga desu ka?,” or “How are you feeling today?” (今日はご機嫌いかがですか？）

Writing Rules for Konnichiwa
There is a rule for writing hiragana “wa” and “ha.” When “wa” is used as a particle, it is written in hiragana as “ha.” “Konnichiwa” is now a fixed greeting. However, in the old days it was a part of sentence, such as “Today is ~ (Konnichi wa ~)” and “wa” functioned as a particle. That’s why it is still written in hiragana as “ha.”

The greeting can be changed to good evening, with, “Konbanwa“ where “this evening” is substituted for the word today. (今晩はご機嫌いかがですか？)