To assume the appearance of, without having the reality; feign; counterfeit; pretend.To act the part of; imitate; be like; resemble.Specifically— In phonology, to imitate in form. See simulation, 2.In biology, to imitate or mimic; resemble by way of protective mimicry: as, some insects simulate flowers or leaves. See mimicry, 3.Feigned; pretended.