en_tn/est/01/20.md

If it pleases the king ... from him ... before him ... Let the king ... the king's decree ... his vast kingdom

Meremoth speaks to the king in third person as a form of respect. AT: If it pleases your Majesty ... from you ... before you ... Please ... your decree ... your vast kingdom" (See: rc://en/ta/man/translate/figs-123person)

When the king's decree is proclaimed

This can be stated in active form. AT: "When they hear the king's decree" or "When they hear what you have commanded" (See: rc://en/ta/man/translate/figs-activepassive)

vast

very wide

from the greatest to the least significant

This is a merism that refers to both extremes and everyone in between. This probably refers to the husbands, but it is possible that it refers to the wives. (See: rc://en/ta/man/translate/figs-merism)