1580s, "fond, loving," from affection + -ate (1); suggested by French affectionné. Early, now mostly obsolete, senses included "prejudiced" (1530s), "inclined" (1530s), "passionate" (1540s), "earnest" (c. 1600). Other forms also used in the main modern sense of this word included affectual "zealous; affectionate" (early 15c.), affectuous "eager, loving" (mid-15c.), affectious (1580s), from Latin affectuosus. Related: Affectionately.