"Morning"—means "Milking"—to the Farmer—
Dawn—to the Teneriffe—
Dice—to the Maid—
Morning means just Risk—to the Lover—
Just revelation—to the Beloved—
Epicures—date a Breakfast—by it—
Brides—an Apocalypse—
Worlds—a Flood—
Faint-going Lives—Their Lapse from Sighing—
Epicure : 
 
 
 A person who cultivates a discriminating palate for good food and drink. 
 A person devoted to sensual pleasure.“ (Collins Concise Dictionary) 
 
 
 It is interesting that Dickinson uses this term because she lived a seemingly frugal lifestyle. She is clearly distancing herself from this particular group of people to suggest that morning does not necessarily mean breakfast for her.
Morning—means Milking—to the Farmer 300