Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Frontier" Definition
noun
A region just beyond or at the edge of a settled area.
Source: American Heritage Dictionary
An international border.
Source: American Heritage Dictionary
An undeveloped area or field for discovery or research: theories on the frontier of astrophysics.
Source: American Heritage Dictionary
The area along an international border.
Source: American Heritage Dictionary
A border between two countries.
Source: Merriam-Webster
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