All 5 Uses

fortitude
in
Moby Dick
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Yet, for all his hardy sobriety and fortitude, there were certain qualities in him which at times affected, and in some cases seemed well nigh to overbalance all the rest.†
Chpt 25-27

fortitude = strength of mind that enables one to endure adversity with courage
But were the coming narrative to reveal in any instance, the complete abasement of poor Starbuck's fortitude, scarce might I have the heart to write it; for it is a thing most sorrowful, nay shocking, to expose the fall of valour in the soul.†
Chpt 25-27
There was an infinity of firmest fortitude, a determinate, unsurrenderable wilfulness, in the fixed and fearless, forward dedication of that glance.†
Chpt 28-30 *
But at length, such calamities did ensue in these assaults—not restricted to sprained wrists and ankles, broken limbs, or devouring amputations—but fatal to the last degree of fatality; those repeated disastrous repulses, all accumulating and piling their terrors upon Moby Dick; those things had gone far to shake the fortitude of many brave hunters, to whom the story of the White Whale had eventually come.†
Chpt 40-42
Stubb saw him pause; and perhaps intending, not vainly, though, to evince his own unabated fortitude, and thus keep up a valiant place in his Captain's mind, he advanced, and eyeing the wreck exclaimed—"The thistle the ass refused; it pricked his mouth too keenly, sir; ha!†
Chpt 133-135

Definitions:

(1) (fortitude)
strength of mind that enables one to endure adversity with courage
(2) (meaning too rare to warrant focus)