What does fortify mean?
Fortify is a verb meaning to strengthen or protect something against attack, hardship, or failure. In its oldest and most concrete sense, it describes building defences around a place: walls, ramparts, trenches, and bastions that make a city harder to capture. Over time the word broadened to cover strengthening of any kind — one can fortify a body with nourishment, a mind with knowledge, a resolve with courage, or even an argument with evidence. The word carries connotations of preparation and resilience, implying that danger is expected but can be withstood. Derived from Latin fortis, 'strong', via Old French fortifier, it entered English in the Middle Ages alongside the vocabulary of warfare and remains equally at home in military history, food labelling (as in fortified cereals), and everyday speech about shoring up confidence or defences.
verbTo strengthen or protect a place, such as a town or fortress, by building defensive works; more broadly, to strengthen something physically, mentally, or morally.
- To strengthen a place against attack by building defences such as walls or trenches.
- To strengthen a person's body, mind, or resolve — often with food, drink, courage, or support.
- To add strength or protection to something abstract, such as an argument, position, or legal claim.
"The city walls were fortified against invasion."
"Medieval engineers fortified the harbour with a chain of stone towers."
"She fortified herself with a strong cup of coffee before the exam."
The word 'fortify' comes straight from the Latin fortis — the same root as 'fortress', which is why every castle wall you've ever seen is literally a word made solid.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fortify
Fortify comes from the Old French 'fortifier', formed from Latin 'fortis', meaning 'strong', combined with the suffix '-ficare', 'to make'. It entered English during the Middle Ages as part of the language of military engineering, alongside related words such as 'fortress' and 'fortification'. Cognates sharing the same Latin root include 'fort', 'fortress', and 'comfort', the latter originally meaning to strengthen or support.
Related word forms
How fortify is actually used
'Fortify' is standard in both everyday and formal contexts. Its figurative use — fortifying oneself with food, drink, or courage — is common and well established, especially in British English ('fortify oneself with tea'). The verb is frequently used passively (e.g. 'was fortified') when describing physical defences.
Easily confused with fortify
'Fortify' is the verb meaning to strengthen a place or person, while 'fortification' is the noun referring to the defensive structures themselves.