Dilatation rhymes with:
facilitation, rehabilitation, facilitation, rehabilitation, accreditation, agitation, amputation, annotation, cohabitation, commutation, computation, connotation, equitation, facilitation, habitation, hesitation, imitation, imputation, inhabitation, meditation, misinterpretation, palpitation, premeditation, prestidigitation, recitation, rehabilitation, reinterpretation, reputation, sanitation, vegetation, visitation
Dilatation sounds like:
daleiden, dalton, daulton, deletion, deltona, dialtone, dilation, dildine, dilithium, dilution, dolton, doulton