Trainband \Train"band`\, n.; pl. {Trainbands}. A band or company of an organized military force instituted by James I. and dissolved by Charles II.; -- afterwards applied to the London militia. [Eng.] He felt that, without some better protection than that of the trainbands and Beefeaters, his palace and person would hardly be secure. --Macaulay. A trainband captain eke was he Of famous London town. --Cowper.