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Definition of Jam
1. Verb. Press tightly together or cram. "The streets jam with crowds"; "The crowd packed the auditorium"
Generic synonyms: Crowd, Crowd Together
Derivative terms: Mob, Pile, Pile, Throng
2. Noun. Preserve of crushed fruit.
Specialized synonyms: Strawberry Jam, Strawberry Preserves
3. Verb. Push down forcibly. "The driver jammed the brake pedal to the floor"
4. Noun. Informal terms for a difficult situation. "He made a muddle of his marriage"
Generic synonyms: Difficulty
Specialized synonyms: Dog's Breakfast, Dog's Dinner
5. Verb. Crush or bruise. "Did he jam his foot? "; "Jam a toe"
6. Noun. A dense crowd of people.
Generic synonyms: Crowd
Specialized synonyms: Snarl-up, Traffic Jam
Derivative terms: Press
7. Verb. Interfere with or prevent the reception of signals. "Block the signals emitted by this station"
Generic synonyms: Break Up, Cut Off, Disrupt, Interrupt
Specialized synonyms: Barrage Jam, Point Jam, Spot Jam, Blanket Jam
Derivative terms: Jamming
8. Noun. Deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems.
Generic synonyms: Ecm, Electronic Countermeasures
Specialized synonyms: Barrage Jamming, Selective Jamming, Spot Jamming
9. Verb. Get stuck and immobilized. "They want to jam the doors"; "The mechanism jammed"
10. Verb. Crowd or pack to capacity. "They jam the books into the box"; "The theater was jampacked"
Generic synonyms: Stuff
Related verbs: Cram
Derivative terms: Wad
11. Verb. Block passage through. "Obstruct the path"
Specialized synonyms: Block Off, Blockade, Barricade, Barricado, Barricade, Asphyxiate, Choke, Stifle, Suffocate, Tie Up, Dam, Dam Up, Block Out, Screen, Earth Up, Land Up, Bar, Barricade, Block, Block Off, Block Up, Blockade, Stop, Back Up, Choke, Choke Off, Clog, Clog Up, Congest, Foul
Generic synonyms: Hinder, Impede
Derivative terms: Blocking, Impediment, Obstructer, Obstruction, Obstructive, Obstructor, Obturator, Occlusion, Occlusive
Antonyms: Free
Definition of Jam
1. n. A kind of frock for children.
2. n. See Jamb.
3. v. t. To press into a close or tight position; to crowd; to squeeze; to wedge in.
4. n. A mass of people or objects crowded together; also, the pressure from a crowd; a crush; as, a jam in a street; a jam of logs in a river.
5. n. A preserve of fruit boiled with sugar and water; as, raspberry jam; currant jam; grape jam.
Definition of Jam
1. Noun. A sweet mixture of fruit boiled with sugar and allowed to congeal. Often spread on bread or toast or used in jam tarts. ¹
2. Noun. A difficult situation. ¹
3. Noun. Blockage, congestion. ¹
4. Noun. (context: popular music) An informal, impromptu performance or rehearsal. ¹
5. Noun. (baseball) A difficult situation for a pitcher or defending team. ¹
6. Noun. (basketball) A forceful dunk. ¹
7. Noun. (''roller derby'') A play during which points can be scored. ¹
8. Noun. Any of several rock-climbing maneuvers requiring wedging of an extremity into a tight space. ¹
9. Noun. (U.K.) luck. ¹
10. Verb. To get something stuck in a confined space. ¹
11. Verb. To brusquely force something into a space; cram, squeeze. ¹
12. Verb. To cause congestion or blockage. Often used with "up" ¹
13. Verb. To block or confuse a broadcast signal. ¹
14. Verb. (baseball) To throw a pitch at or near the batter's hands. ¹
15. Verb. (music) To play music (especially improvisation as a group.) ¹
16. Verb. To injure a finger or toe by sudden compression of the digit's tip. ¹
17. Verb. (''roller derby'') To attempt to score points. ¹
¹ Source: wiktionary.com
Definition of Jam
1. to force together tightly [v JAMMED, JAMMING, JAMS] : JAMMABLE [adj]
Medical Definition of Jam
1.
1. A mass of people or objects crowded together; also, the pressure from a crowd; a crush; as, a jam in a street; a jam of logs in a river.
2. An injury caused by jamming.
A preserve of fruit boiled with sugar and water; as, raspberry jam; currant jam; grape jam. Jam nut. See Check nut, under Check. Jam weld, a butt weld. See Butt.
Origin: Prob. Fr. Jam, v.; but cf. Also Ar. Jamad ice, jelly, jamid congealed, jamd congelation, ice.