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discharge (v.)

early 14c., "to exempt, exonerate, release, free (from an obligation)," from Old French deschargier "to unload, discharge" (12c., Modern French décharger), from Late Latin discarricare, from dis- "do the opposite of" (see dis-) + carricare "to load a wagon or cart," from Latin carrus "two-wheeled wagon" (see car).

Meaning "to fulfill, to perform (one's duties, etc.)" is from c. 1400.  Sense of "dismiss from office or employment" is from c. 1400. Meaning "to unload, to free from, disburden" is late 14c. Of weapons, "send forth by propulsion," transitive, 1550s; "to fire off," intransitive, 1580s. Of a river, "to empty itself," c. 1600. The electrical sense is first attested 1748. Related: Discharged; discharging.

Origin and meaning of discharge

discharge (n.)

late 14c., "relief from misfortune," see discharge (v.). Meaning "release from work or duty" is from early 15c. Meaning "act of sending out or pouring forth" is from c. 1600; sense of "that which is emitted or poured forth" is from 1727. Meaning "action of firing off a firearm or other missile weapon" is from 1590s. Electricity sense is from 1794. 

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Definitions of discharge from WordNet
1
discharge (v.)
complete or carry out;
discharge one's duties
Synonyms: dispatch / complete
discharge (v.)
pour forth or release;
discharge liquids
discharge (v.)
free from obligations or duties;
Synonyms: free
discharge (v.)
remove the charge from;
discharge (v.)
go off or discharge;
Synonyms: fire / go off
discharge (v.)
pronounce not guilty of criminal charges;
Synonyms: acquit / assoil / clear / exonerate / exculpate
discharge (v.)
eliminate (a substance);
Synonyms: exhaust / expel / eject / release
discharge (v.)
remove (cargo, people, etc.) from and leave;
Synonyms: drop / drop off / set down / put down / unload
discharge (v.)
cause to go off;
Synonyms: fire
discharge (v.)
release from military service;
Synonyms: muster out
discharge (v.)
become empty or void of its content;
Synonyms: empty
2
discharge (n.)
the sudden giving off of energy;
discharge (n.)
the act of venting;
Synonyms: venting
discharge (n.)
a substance that is emitted or released;
Synonyms: emission
discharge (n.)
any of several bodily processes by which substances go out of the body;
the discharge of pus
Synonyms: emission / expelling
discharge (n.)
electrical conduction through a gas in an applied electric field;
Synonyms: spark / arc / electric arc / electric discharge
discharge (n.)
the pouring forth of a fluid;
Synonyms: outpouring / run
discharge (n.)
the termination of someone's employment (leaving them free to depart);
Synonyms: dismissal / dismission / firing / liberation / release / sack / sacking
discharge (n.)
a formal written statement of relinquishment;
Synonyms: release / waiver
discharge (n.)
the act of discharging a gun;
Synonyms: firing / firing off
From wordnet.princeton.edu