only 1 use
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- The battered school-book of Tom's which she held on her knees could give her no fortitude under the pressure of that dread; and again and again her eyes had filled with tears, as they wandered vaguely, seeing neither the chestnut-trees, nor the distant horizon, but only future scenes of home-sorrow.4.3 -- Book 4 Chapter 3 -- A Voice from the Past (4% in)
There are no more uses of "fortitude" in The Mill on the Floss.
Typical Usage (best examples)