Hallelujah means 'praise God' or praise Jah or praise Jehovah...(from the first two letters of YHWH), used by Christians to shout their joy towards God
Amen means 'So be it' or It is so or Truly, from the Hebrew aman which means to be faithful, support, or confirm.
Hosanna means 'Save Us!'
or praise, like Hallelujah
from the most trusted of sources, straight off the internet...
hamensanna!
