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non·di·rec·tion·al | \ ˌnän-də-ˈrek-shnəl 
, -shə-nᵊl, -(ˌ)dī- \
, -shə-nᵊl, -(ˌ)dī- \Definition of nondirectional
: not of, relating to, or indicating direction in space : not directional especially : equally effective in all directions a nondirectional light nondirectional radar
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The first known use of nondirectional was in 1879
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