What does hosanna mean?

Answer 1

Hosanna is a Christianized form of the Hebrew words Hosha na (הושע נא). It is a contraction of the words "save" and "please" ("hosha" and "na"). In Jewish contexts, it is only used only during the harvest festival of Sukkot to refer to a cycle of prayers uttered each morning.

In Christianity, it has a broader meaning.

it means "save us"

the way for going worship...

Answer 2

In Hebrew this is 2 words, usually hyphenated:

הושיעה־נא (Hoshaʿ-na) = "Please help"

Na is a particle that is attached to commands to soften them, in the way that we add the word "please"

Christians have made this into a single word, and converted it to Greek pronunciation "Hosanna," and translate it as save we ask.

Note:

In Jewish liturgy, the word is applied specifically to the Hosha-na Service, a cycle of prayers from which a selection is sung each morning during Sukkot, the Feast of Booths or Tabernacles. The complete cycle is sung on the seventh day of the festival, which is called Hoshana Rabbah (הושענא רבא, "Great Hosha-na".