burden, collection, sign of fire, (great) flame, gift, lifting up, mess, oblation, reward

Concise Bible Dictionary:

Besides the common use of this word, it occurs at the commencement of several prophecies; as “The burden of Babylon,” “the burden of Moab” (Isa. 13:1; Isa. 15:1). The learned are not agreed as to the force of massa in such places: its natural meaning would be “a judgment that lies heavy on the people;” but some take its meaning to be “an oracle or sentence pronounced against them.” The word occurs also in Jeremiah 23:33-38, where it is “the burden of the Lord.” The false prophets were not to use this expression, as if they had a message from God. If they did, it should bring judgment upon them. The same word is translated “prophecy” in Proverbs 30:1 and Proverbs 31:1.

Strong’s Dictionary of Hebrew Words:

Transliteration:
mas’eth
Phonic:
mas-ayth’
Meaning:
from 5375; properly, (abstractly) a raising (as of the hands in prayer), or rising (of flame); figuratively, an utterance; concretely, a beacon (as raised); a present (as taken), mess, or tribute; figuratively, a reproach (as a burden)
KJV Usage:
burden, collection, sign of fire, (great) flame, gift, lifting up, mess, oblation, reward