Webster's English Dictionary

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equilibrium

equi.lib.ri.um \.e--kw*-'lib-re--*m, .ek-w*-\ \-re--*\ n or equilibriums or 
   equi.lib.ria [L aequilibrium, fr. aequilibris in equilibrium, fr. aequi- +] 
   pl  libra weight, balance 1: a static or dynamic state of balance between 
   opposing forces or actions  2: a state of adjustment between opposing or 
   divergent influences or elemen ts 3: the normal oriented state of the 
   animal body in respect to its environme nt