What does amenity mean?

interjection1.it is so; so be it (used after a prayer, creed, or other formal statement to express solemn ratification or agreement).

-adverb2.verily; truly.

-noun3.an utterance of the interjection "amen."

4.a musical setting for such an utterance.

5.an expression of concurrence or assent: The committee gave its amen to the proposal.

Origin:

bef. 1000; ME, OE < LL < Gk < Heb āmēncertainty, certainly

Amen can be said at the end of a prayer or a statement of approval. It means 'so it be' or or 'so be it!'

In Hebrew prayer, when someone utters a blessing, if others say "Amen" it is as if they also uttered the blessing. This may occur, for example, in the synagogue when the cantor is chanting the Shemoneh Esrei after the congregation has performed the prayer silently. Anyone who has not performed the prayer by himself can, by saying Amen at certain points in the cantor's praying, be considered to have fulfilled the prayer obligation.

Muslims and Christians also use this Word at the end of prayer. For Muslims, the Arabic Word is usually spelled Amin or Ameen in the Roman alphabet.