senr. abbrev. of senior a. 1 a. Cf. , sen. 1763J. Bell Trav. from St. Petersburg p. v/1 Peter Bell, senr. Esq.1885T. Hardy Let. 18 Mar. (1978) I. 131 The arrangement I made with Mr Macmillan Senr & Mr Craik.1932Blunden Face of England 73 John Bowers, senr., came through the clap-gate.