先生 — meaning in English

xiān sheng

English meaning

arbiter noun Someone chosen by two sides to settle a dispute between them.
dominant adj More powerful, important, or noticeable than others in the same category.
gentleman noun A polite, well-mannered, or honorable man.
liege noun In feudal times, a lord entitled to service and loyalty from his subjects, or (less often) the subject who owed that loyalty.
lord noun A man who holds a title of nobility, or a ruler with power over others.
lordship noun The rank, title, or condition of being a lord.
master noun A person with exceptional skill or deep expertise in something.
mister noun A title of respect used before a man's name, usually written "Mr."
overlord noun A ruler who holds power over other rulers or lower authorities.
sir noun A polite or respectful way to address a man, especially one of higher rank, a stranger, or a teacher.
sire noun The male parent of an animal, especially in breeding contexts.
squire noun Historically, a young nobleman who served and assisted a knight.

先生 is used for these senses in English:

Mr. (North America, Philippines, formerly or traditionally UK) Abbreviation of Mister.
Your Excellency (formal) A title of respect used when addressing heads of state other than monarchs, heads of government, governors, ambassadors, certain ecclesiastics, royalty, and others holding equivalent rank.
arbiter (with of) A person or object having the power of judging, determining, or ordaining; one whose power of deciding and governing is not limited.
dominant Ruling; governing; prevailing
gentleman Any well-bred, well-mannered, or charming man.
liege A free and independent person; specifically, a lord paramount; a sovereign.
lord (obsolete, uncommon) A baron or lesser nobleman, as opposed to greater ones
lordship (hence, with "his" or "your", often capitalised) Title applied to a lord, bishop, judge, or another man with a title.

noun Someone chosen by two sides to settle a dispute between them.
noun Someone or something with the power to judge or decide, without needing anyone else's approval.

adj More powerful, important, or noticeable than others in the same category.
adj Genetics: describing a gene or trait that is expressed even when only one copy is present.