Etymology
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Marcus 
masc. proper name, from Latin Marcus, Roman praenomen, traditionally said to be related to Mars, Roman god of war.
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Marcellus 
masc. proper name, Latin, diminutive of Marcus.
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Marcia 

fem. proper name, from Latin Marcia, fem. of Marcius, a Roman gens name, related to Marcus (q.v.).

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Marcella 

fem. proper name, Latin, fem. of Marcellus, itself a diminutive of Marcus. Marcellina was the name of a female Gnostic of 2c. and a teacher of Gnosticism in Rome.

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Mark 

masc. proper name, variant of Marcus (q.v.). Among the top 10 names given to boy babies born in the U.S. between 1955 and 1970.

Mark Twain is the pseudonym of American writer and humorist Samuel Langhorne Clemens (1835-1910), who had been a riverboat pilot; he took his pen name from the cry mark twain, the call indicating a depth of two fathoms, from mark (n.1) in a specialized sense of "measured notification (a piece of knotted cloth, etc.) on a lead-line indicating fathoms of depth" (1769) + twain.

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Antonine (adj.)
1680s, in reference to Roman emperors Antoninus Pius (ruled 138-161 C.E.) and Marcus Aurelius Antoninus (161-180). For the name, see Anthony. Earlier (1540s) of the followers of St. Anthony of Egypt; later Antonian (1904) was used in this sense.
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Brutus 

Roman surname of the Junian gens. Its association with betrayal traces to Marcus Junius Brutus (c. 85 B.C.E.-42 B.C.E.), Roman statesman and general and conspirator against Caesar. The Brutus (Englished as Brute) who was the mythological eponymous founder of Britain in medieval legend was said to be a descendant of Aeneas the Trojan.

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Tironian 

of or pertaining to Marcus Tullius Tiro, Cicero's scribe and namesake, 1828, especially in reference to the Tironian Notes (Latin notæ Tironianæ), a system of shorthand said to have been invented by him (see ampersand).

Although involving long training and considerable strain on the memory, this system seems to have practically answered all the purposes of modern stenography. It was still in familiar use as late as the ninth century. [Century Dictionary]
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