“Language” From Boyd’s Bible Dictionary:
(tongue). Originally one (Gen. 11:1). Diversified at Babel (Gen. 11:7-9).
“Tongues” From Boyd’s Bible Dictionary:
“And the whole earth was of one language, and of one speech”
(Gen. 11:1). Confusion of tongues and dispersion of peoples coincident (Gen. 11:7-9). “New tongues” (Mark 16:17), is the first notice of a gift specially characteristic of the first outpouring of the Spirit. Ten days afterward the promise was fulfilled in the Pentecostal phenomenon (Acts 2:1-13).
Strong’s Dictionary of Greek Words:
Transliteration:
dialektos
Meaning:
from 1256; a (mode of) discourse, i.e. "dialect"
KJV Usage:
language, tongue