Lewis Short
(adverb) : proptĕrĕā, propter-is
* Therefore, for that cause, on that account (syn.: ideo, idcirco, inde; class.): quia mihi natalis est dies, propterea te vocari ad cenam volo,Plaut. Capt. 1, 2, 71: propterea ... quia,Cic. Div 1, 14, 25; 2, 22, 49; id. Lael. 2, 6: haec propterea de me dixi, ut, etc.,id. Lig. 3, 8: propterea quoniam,Gell. 3, 6: propterea, quod,because that,Cic. Rep. 1, 6, 11; id. Fam. 9, 18, 1.—Esp. with reference to something just said: scio, Et pol propterea magis nunc ignosco tibi,Ter. Eun. 5, 2, 40; id. And. 4, 2, 10: id propterea nunc hunc venientem sequor,with that in view, therefore,id. ib. 2, 5, 3: ergo propterea... ne, etc.,id. Hec. 1, 1, 6.
Charlton T. Lewis, Charles Short, A Latin Dictionary