located or designed to be used at a military front line: a front-line ambulance helicopter.
of, pertaining to, or involving the forefront in any action, activity, or field: a front-line TV reporter.
highly experienced or proficient in the performance of one's duties.

1910–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To frontline
Example sentences
Most of the great papers did not appear in frontline journals.
The frontline weapon for this electronic war is a new airborne jamming system currently in development.
Computer displays inside tanks and other technology will help frontline troops better discern friend from foe.
Their reception areas are isolated frontline structures where the security checks are done.
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