Denshi Jisho — Online Japanese dictionary

挨拶 あいさつ 1: greeting; greetings; salutation; salute;
2: speech (congratulatory or appreciative); address;
3: reply; response;
4:
5: (Slang) revenge; retaliation; (Expression) a fine thing to say (used as part of a sarcastic response to a rude remark);
6: (orig. meaning) dialoging (with another Zen practitioner to ascertain their level of enlightenment)
Common word, Noun, Suru verb, No-adjective 
ご挨拶 ごあいさつ 1: (Polite language) greeting;
2: a fine thing to say (used as part of a sarcastic response to a rude remark)
Noun 
御挨拶 ごあいさつ 1: (Polite language) greeting;
2: a fine thing to say (used as part of a sarcastic response to a rude remark)
Noun 
一挨一拶 いちあいいっさつ dialoging (with another Zen practitioner to ascertain their level of enlightenment) (source of modern word aisatsu)
Noun, Archaism 
年頭挨拶 ねんとうあいさつ New Year's greetings
Noun 
時候の挨拶 じこうのあいさつ season's greetings (conventional way of beginning a letter)
Expression 
年頭の挨拶 ねんとうのあいさつ New Year's greetings
Noun 

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