What does desertion mean?
Desertion is the act of abandoning a duty, post, or allegiance that one is obligated to uphold. Its most prominent sense is legal and military: the unauthorized absence of a soldier from their unit or station, typically with no intention of return — an offence historically punished severely, sometimes by death. Beyond the battlefield, desertion describes the broader act of forsaking people, causes, or responsibilities, whether a politician abandoning their party or a parent abandoning their family. The word carries strongly negative connotations of betrayal, dereliction, and broken trust, and it tends to appear in formal, legal, or moral discourse rather than casual conversation. Related forms include the verb 'to desert' and the noun 'deserter', referring to the individual who abandons their post. Because it names a failure of loyalty in contexts where loyalty matters most, desertion remains a powerful word in both law and everyday moral judgement.
The act of abandoning a post, duty, or allegiance one is bound to maintain; especially unlawful absence from military service with no intention of returning.
"Desertion from the ranks was treated as a capital offence during the war."
In military law, desertion is distinguished from AWOL (absent without leave) by intent: desertion requires evidence of permanent departure rather than temporary absence.
The act of forsaking a person, group, or cause to which one owes loyalty or support.
"Her desertion of the team mid-project left colleagues feeling betrayed."
Used when referring to multiple instances of abandonment, often in historical or statistical contexts.
"The army recorded dozens of desertions over the winter months."
In many armies, desertion during wartime has historically been punishable by death — making this small word carry some very heavy consequences.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of desertion
'Desertion' derives from Latin 'desertio', formed from 'desertus', the past participle of 'deserere', meaning 'to abandon' or 'forsake'. The verb itself combines 'de-' (away) with 'serere' (to join, bind). It entered English via Old French in the late medieval period, with its modern form established by the 16th century. Cognate words sharing the same root include 'desert' (both verb and noun), 'deserter', and more distantly 'series' and 'assert', all tracing back to the Latin 'serere'.
Related word forms
How desertion is actually used
Formal in register, 'desertion' carries strong negative connotations of betrayal and breach of trust. It is most commonly used in military and legal contexts but also appears in discussions of politics, relationships, and organizational loyalty.
Easily confused with desertion
Despite similar spelling, 'dessert' refers to a sweet course at the end of a meal, while 'desertion' means abandoning one's duty or allegiance.
As a noun, 'desert' means an arid land; as a verb it means to abandon. 'Desertion' is specifically the noun form describing that act of abandonment.