Meow
A meow was a vocalization made by a cat.
When the entity masquerading as Marla Aster was simulating her home for Jeremy Aster, the simulated Patches meowed nine times. (TNG: "The Bonding")
In 2369, when Spot meowed to get Data's attention and he responded, Geordi La Forge jokingly stated that she was training Data instead of him training her. (TNG: "A Fistful of Datas")
When Spot had kittens, Data first noticed them because he heard them meowing. (TNG: "Genesis")
In 3188, as Cleveland Booker was picking up and holding his cat Grudge, she was meowing. She had been on the floor of his ship. (DIS: "That Hope Is You, Part 1")
When Grudge jumped into Ryn's arms and meowed, Ryn exclaimed, "What is this?! Why is it making that noise?!". Sylvia Tilly explained Grudge's species, but did not explain why she was meowing. (DIS: "The Sanctuary")
When Book handed Grudge to Tracy Pollard, Grudge meowed. (DIS: "Su'Kal")
When Miles O'Brien first met Chester, the latter meowed. He later meowed again when O'Brien adopted him. (DS9: "Honor Among Thieves")
The word could also be used as an expression of appreciation for a good-looking person. (LD: "Envoys")