barriers

Noun

barrier (plural barriers)

1. A structure that bars passage.
   • The bus went through a railway barrier and was hit by a train.
2. An obstacle or impediment.
   • Even a small fee can be a barrier for some students.
3. A boundary or limit.
   • Few marathon runners break the three-hour time barrier.
4. A node (in government and binding theory) said to intervene between other nodes A and B if it is a potential governor for B, c-commands B, and does not c-command A.
5. A separation between two areas of the body where specialized cells allow the entry of certain substances but prevent the entry of others.
6. (historical) The lists in a tournament.

See all 9 meanings of barrier