noun / ~する noun / ~の noun:

• greeting; greetings; salutation; salute; polite set phrase used when meeting or parting from somebody
• polite set phrase used to express apology, sympathy, congratulations, etc.
• speech (congratulatory or appreciative); address
• reply; response
• revenge; retaliation - slang

expression:

• a fine thing to say - used sarcastically as a response to a rude remark; usu. in the form of ご挨拶 - humorous term
• dialoging (with another Zen practitioner to ascertain their level of enlightenment) - orig. meaning ➜ 一挨一拶

noun:

• relationship (between people); connection - archaism
• intervention; mediation; mediator - archaism