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n. also front line
1. A front or boundary, especially one between military, political, or ideological positions.
2. Basketball See frontcourt.
3. Football The linemen of a team.
4. Sports The players who play farthest forward, as in volleyball.
adj. or front-line
1. Located or used at a military front.
2. Of or relating to the most advanced or important position or activity in a field or undertaking: "elicited candid revelations from many of the front-line executives ... and doggedly followed the money trail down all its byways" (Steve Fraser).
a. Of or relating to the frontline.
b. Being a member of the regular team; first-string: a team in need of a frontline catcher.
4. Performing the most basic tasks or interacting directly with customers, patients, or clients: a frontline caregiver; frontline caseworkers.
2. the visible forefront in any action, activity, or field.
1. located or designed to be used at a military front line: a front-line helicopter.
2. of, pertaining to, or involving the forefront in any action, activity, or field: front-line athletics.