The Last Enchantment -- FR 2.viii.377

As they passed her they turned and their eyes watched her slowly floating away from them. For so it seemed to them: Lórien was slipping backward, like a bright ship masted with enchanted trees, sailing on to forgotten shores, while they sat helpless upon the margin of the grey and leafless world. 

(FR 2.viii.377)

Up to this point in The Lord of the Rings the word 'enchantment' and forms of the verb 'enchant' are used synonymously, or nearly so, with 'spell'. Afterwards 'spell' has a negative meaning. A spell tricks or deceives or dominates those upon whom it is cast. The only time it may not do so is when Legolas, speaking of the Huorns, refers to 'the spell' of the forest (TT 3.viii.541). It is worth noting, however, that he is not affected by that spell, but Gimli's fear may well indicate that he is (TT 3.ix.549). At the very least Gimli could not be said to have a positive view of 'the spell of the forest'. 

Concomitant with this narrowing of the meaning of 'spell' is the near disappearance of 'enchant' or 'enchantment' from the text. Only one form of it occurs hereafter, referring to Saruman's voice -- 'Suddenly another voice spoke, low and melodious, its very sound an enchantment' (TT 3.x.578) -- and significantly that enchantment fails to attain its ultimate goal.

When Lothlórien begins to fade from Middle-earth, enchantment fades with it. While we could not say that only 'the deceits of the enemy' remain (FR 2.vii.362), this shift in usage is a harbinger of the passing of Faërie in Middle-earth.