1.  dilution(n = noun.substance) - a diluted solution;
is a kind of solution
Derived form verb dilute₁

2.  dilution(n = noun.act) - weakening (reducing the concentration) by the addition of water or a thinner;
is a kind of weakening
has particulars: cutting, thinning
Antonym: concentration
Derived forms verb dilute₁, verb dilute₂

N  water, serum, serosity, lymph, rheum, diluent, agua, aqua, pani, dilution, maceration, lotion, washing, immersion, humectation, infiltration, spargefaction, affusion, irrigation, douche, balneation, bath, deluge, high water, flood tide, watery, aqueous, aquatic, hydrous, lymphatic, balneal, diluent, drenching, diluted, weak, wet, the waters are out.