Accent
An accent was a vocal inflection particular to the people in a specific geographical region. 

In 2152, a Risan woman told Hoshi Sato that she spoke the Risan language with hardly any accent. () Feezal Phlox also noticed the same thing when Sato spoke Denobulan. ()

Also that same year, Soval noticed that T'Pol had developed a slight Human accent. ()

In 2154, Arik Soong speculated that, based on his hearing of 's accent, the Orions were similar to his ancestors. ()

In both the prime reality and the alternate reality, Pavel Chekov's Russian accent caused him to pronounce "V"s as "W"s and vice versa. A passerby had difficulty understanding Chekov who was looking for "nuclear wessels" in Alameda. () The computer of the alternate reality  could not entirely distinguish between accented speech and a mistake in a spoken authorization code, much to 's frustration. It required several tries for him to pronounce the code distinctly enough for the computer to recognize it and allow him access. ()

In 2259 of the alternate reality,  spoke with a British accent, though her prime reality counterpart did not. (; )

In 2269, Nurse Christine Chapel mimicked Montgomery Scott's Scottish accent while praising his bedside manner with Mira Romaine. ()

Lwaxana Troi commented in 2364 that her daughter's accent sounded much like that of Deanna's late father, Ian Andrew Troi. ()

In 2369, multiple holographic characters from an Ancient West holoprogram  (which, due to a computer glitch, took on the appearance of Data) exhibited different accents, including Western and Mexican. ()

In 2372, Vedek Porta complimented Benjamin Sisko on his improving accent when speaking in the Bajoran language. ()

In 2374, Vic Fontaine removed the Russian accent from Julian Bashir's holographic character Lola Chrystal – a feat which took over an hour – to allow Odo to pretend she was Kira Nerys. ()

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Linguistics