Lord

The title lord or lady was a term typically used to address individuals holding certain positions, such as noblemen. The term was also used as an alternate term for the Christian "God", and as a general honorific used by the androids of Mudd for those they serve. In ancient England, a lord might be referred to as "his lordship". 

The title was historically used on Earth for noblemen in some nation states. Some figures holding the title of lord on Earth were Lord Byron, Lord Halifax, and Lord Nelson. Additionally, a fictional 19th century Lord Burleigh appeared in Kathryn Janeway's holonovel Janeway Lambda one. On a drawing by Gaby titled "" in 2151, she drew a cat with an EV helmet and wrote the word "lady" above the cat. 

''In the mirror universe, the title was in use by the Terran Empire well into the 23rd century. "Lords of the Empire" were aboard the when $𝜇$ managed to take over the ship, and were executed by his people.''

Troyian ambassador Petri was referred to as lord. 

An insane Garth of Izar insisted on being called "Lord Garth" while he temporarily took control of the Elba II asylum. 

The term "lord" was also used in Klingon society. L'Rell and Voq typically addressed T'Kuvma as "my lord". When L'Rell referred to Voq with that phrase after T'Kuvma was killed in battle, Voq questioned why she was doing so, to which she reminded him that T'Kuvma had made Voq his successor. Voq, on the other hand, continued to refer to T'Kuvma as "my lord". While feigning allegiance to, L'Rell addressed him with that phrase. He was also referred to as "my lord" by his true followers. Klingon commander Kruge was likewise referred to by Valkris and his crew as "my lord". 

In 2263 of the alternate reality, exclaimed, "Lordy!''" in reaction to taking his first mouthful of Glenfiddich. Similarly, stated, "Oh, my good Lord," upon  that the wreckage of a ship that Jaylah had found on the surface of the planet Altamid was actually the USS Franklin.''