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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.