to ward off attack from; guard against assault or injury (usually followed by from or against ): The sentry defended the gate against sudden attack.
2.
to maintain by argument, evidence, etc.; uphold: She defended her claim successfully.
3.
to contest (a legal charge, claim, etc.).
4.
Law.to serve as attorney for (a defendant): He has defended some of the most notorious criminals.
5.
to support (an argument, theory, etc.) in the face of criticism; prove the validity of (a dissertation, thesis, or the like) by answering arguments and questions put by a committee of specialists.
6.
to attempt to retain (a championship title, position, etc.), as in a competition against a challenger.
Origin: 1200–50;Middle Englishdefenden < Old Frenchdefendre < Latindēfendere to ward off, equivalent to dē-de- + -fendere to strike
Related forms
de·fend·a·ble, adjective
de·fend·er, noun
pre·de·fend, verb (used with object)
un·de·fend·a·ble, adjective
un·de·fend·a·ble·ness, noun
un·de·fend·a·b·ly, adverb
un·de·fend·ed, adjective
un·de·fend·ing, adjective
well-de·fend·ed, adjective
Synonyms 1. shelter, screen, shield; garrison, fortify. Defend, guard, preserve, protect all mean to keep safe. To defend is to strive to keep safe by resisting attack: to defend one's country. To guard is to watch over in order to keep safe: to guard a camp. To preserve is to keep safe in the midst of danger, either in a single instance or continuously: to preserve a spirit of conciliation. To protect is to keep safe by interposing a shield or barrier: to protect books by means of heavy paper covers.2. vindicate.
mid-13c., from O.Fr. defendre, from L. defendere "ward off, protect," from de- "from, away" + fendere "to strike, push." In the Mercian hymns, L. defendet is glossed by O.E. gescildeð.