Taxable \Tax"a*ble\, a. 1. Capable of being taxed; liable by law to the assessment of taxes; as, taxable estate; taxable commodities. 2. (Law) That may be legally charged by a court against the plaintiff of defendant in a suit; as, taxable costs. -- {Tax"a*ble*ness}, n. -- {Tax"a*bly}, adv.