for·ti·tude noun \ˈfȯr-tə-ˌtüd, –ˌtyüd\ : mental strength and courage that allows someone to face danger, pain, etc.
Full Definition of FORTITUDE
1: strength of mind that enables a person to encounter danger or bear pain or adversity with courage
2 obsolete: strength
Origin of FORTITUDE
Middle English, from Latin fortitudin-, fortitudo, from fortis
First Known Use: 12th century
Definition source: http://www.merriam-webster.com
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