You are correct. The word for "world" in Matthew 24:14, as in "preached in all the world," is:
(3625) oy-kou-men’-ay; feminine participle presumed passive of (3611) (oijke>w) (as noun, by implication of (1093) (gh~)); land, i.e. the (terrene part of the) globe; specially the Roman empire: — earth, world.
The same word is used in Luke 2:1 regarding Caesar taxing "all the world," which must have been the Roman Empire.
Two related verses that use that Greek word are Acts 11:28 (great dearth throughout all the world) and Rom 10:17-18 (words (heard) unto the ends of the world.)
Some of the other verses that use that Greek word are:
"Because thou hast kept the word of my patience, I also will keep thee from the hour of temptation, which shall come upon all the world, to try them that dwell upon the earth." (Rev 3:10)
"And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him." (Rev 12:9)
"For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty." (Rev 16:14)
Philip
Right there is your instead of Christ.. Are you ready for his arrival or will you believe him when he claims he is Jesus?