barrier

barrier /ˈberijɚ/ noun
plural barriers
barrier
/ˈberijɚ/
noun
plural barriers
Britannica Dictionary definition of BARRIER
[count]
1 
: something (such as a fence or natural obstacle) that prevents or blocks movement from one place to another
— see also barrier island, barrier reef, crash barrier
2 
a  : a law, rule, problem, etc., that makes something difficult or impossible
b  : something that makes it difficult for people to understand each other — often + between
3 
: a level, amount, or number that is difficult to get past
— see also sound barrier