Synonym: border, outskirts. Similar words: confront, in front of, the front line, confrontation, twentieth, on time, continue, continued. Meaning: ['frʌn'tɪr /-‚tɪə] 
n. 1. a wilderness at the edge of a settled area of a country 2. an international boundary or the area (often fortified) immediately inside the boundary 3. an undeveloped field of study; a topic inviting research and development.
n. 1. a wilderness at the edge of a settled area of a country 2. an international boundary or the area (often fortified) immediately inside the boundary 3. an undeveloped field of study; a topic inviting research and development. 
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91. Like any other frontier, California was born out of a society of men.
92. This increased the importance of exploration and development projects in frontier areas.
93. Additional forces were sent to these frontier outposts to give them protection insofar as limited resources would permit.
94. It marked a return to the general store of frontier days.
95. As noted, the frontier and the West had their own expansive mood.
96. And once they made it to the frontier of engineering, the trek to a degree would be even more perilous.
97. The fugitive slave problem on the southeastern frontier dated back to the colonial period.
98. It was possible to feel the antagonism and hatred of the two sets of guards facing each other across the frontier.
99. The electronic frontier requires its pioneers to be resourceful in defending themselves in the absence of binding rules and regulations.
100. Exercise and fitness has become the final frontier. Whatever next?
101. San Vicente del Caguan is a bustling frontier town of 20,000 people.
102. This tradition persisted even after the dissolution of the military frontier in 1881.
103. The study of the brain is often described as the next intellectual frontier.
104. But his aspirations go beyond the global: he envisions outer space as his next frontier.
105. After a brief stay in the frontier capital, Smith was back on the Santa Fe Trail, guiding pioneers westward.
106. Western defenders of the deal claimed that the frontier question was not a legal matter but simple recognition of an existing reality.
107. To the settler or trapper or cattleman, the western frontier was both promising and dangerous.
108. One of my other favorite games was playing outlaw, riding the range on the Wild West frontier.
109. We are perfect machines built to defend colonists on frontier worlds.
110. In the following chapters I survey this unified bionic frontier.
111. Want a glimpse of frontier lore without the commercialism and crowds?
112. But an out-of-work military leader more often found a war-ridden frontier where he could operate without needing to consult his king.
113. His next triumph was to secure agreement from important Frontier leaders to an agreed constitutional solution.
114. Every diplomatic effort was made to get him and his army to retire back over the frontier,(www.Sentencedict.com) but without success.
115. He is an example of some one who has become lost or disoriented on the new frontier.
116. Consequently, frontier controls were necessary to ensure that cross-frontier trade in goods adhered to the various national requirements.
117. It is a world unexplored by many-a new frontier in contemporary gastronomy with enormous potential.
118. They were the pioneers willing to accept the rough edges of life on the technological frontier.
119. Andrew Jackson, the first president from the western frontier, was unjustly accused of bigamy and derided as an unschooled ignoramus.
120. These are national quotas and must be removed or harmonised once frontier controls are eliminated.
More similar words: confront, in front of, the front line, confrontation, twentieth, on time, continue, continued, continent, continuing, continuous, pay attention to, a bone of contention, on the contrary, tie up, fierce, carrier, patient, barrier, supplier, facilities, irony, bronze, bear on, strong, patron, go wrong, chronic, frown, from.