Definition of associative law
: a law indicating immateriality in the grouping of variables specifically : any law of the form (φRχ)Rψ=φR(χRψ) where φ, χ, ψ are variables and R a dyadic operator [as (a + b) + c=a + (b + c) in arithmetic or (pvq)vr.≡. p v(qvr) in the propositional calculus]
— called also principle of association
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