"frontier" In Word Games

1. [countable] a line that separates two countries, etc.; the land near this line
2. the frontier [singular] the edge of land where people have settled and built towns, beyond which the country is wild and unknown, especially in the western US in the 19th century
3. [countable, usually plural] frontier (of something) the limit of something, especially the limit of what is known about a particular subject or activity

"frontier" synonyms:

• border,
• boundary,
• limit,
• perimeter,
• borderline,
• edge,
• borderland,
• marches,
• bound,
• confines,
• march,
• partition,
• verge,
• bounds,
• rim,
• bounding-line,
• demarcation-line,
• dividing-line,
• border-line

"frontier" antonyms:

• centre,
• center,
• inside,
• interior,
• metropolis,
• middle,
• heart,
• hub,
• midpoint,
• nucleus,
• core,
• midsection,
• central-point,
• halfway-point,
• mid-point,
• heartland,
• halfway,
• central,
• midst

• infector
• notifier
• renotify