What does jammer mean?
A jammer is, most commonly, a device or person that deliberately disrupts communications by interfering with radio, television, cellular, or other electronic signals. Such interference is called jamming and may involve transmitting noise or signals that overwhelm the intended message. The word also has a less formal musical sense: a jammer can be someone who plays loudly, creates a din, or joins others in an improvised musical session. In technical writing, terms such as radio jammer, signal jammer, and communications jammer specify the particular system being disrupted. The word is recognized in British and American English, though radio and telecommunications usage is especially prominent in news, military, aviation, security, and regulatory discussions. It is useful because it names both an agent of interference and the equipment commonly used to cause it.
A person or device that deliberately interferes with the transmission or reception of radio, television, cellular, or other communications signals.
"Security personnel detected a jammer operating near the radio tower."
Usually used with a modifier identifying the affected system, such as radio jammer or signal jammer.
Informally, a person who makes loud or disruptive music or participates in an energetic jam session.
"The drummer joined the other jammer players for an extended improvisation."
This sense is informal and less common than the telecommunications sense.
The plural is used for multiple people or devices that interfere with signals.
"Several jammers were used during the operation."
A radio jammer can silence a communication channel simply by flooding it with unwanted signals.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does jammer come from?
Jammer was formed in the 20th century by adding the suffix -er to jam, the verb meaning to interfere with or block the transmission or reception of a signal. The verb jam had earlier been used for making a space too narrow or crowded and, by extension, for impeding movement or communication. The related sense of pressing or wedging something firmly into place helped lead to the telecommunications meaning. The suffix -er identifies a person or device that performs the action.
How jammer is actually used
The technical sense is standard in telecommunications, broadcasting, and security contexts. The musical sense is informal and can sound dismissive or describe someone participating in a jam session, depending on context.
Easily confused with jammer
A jammer interrupts or blocks communications, whereas a jamboree is a large gathering, festival, or celebration.