UFO
n. countablen. Stands for unidentified flying object. A strange object seen in the sky that people cannot explain or identify. You often hear this word when people talk about aliens or spaceships.
n. Abbreviation for unidentified flying object; any aerial phenomenon that cannot be readily identified or explained by the observer. Often associated with extraterrestrial hypotheses in popular culture.
The pilot reported seeing a bright UFO over the desert.
Local residents gathered to watch the strange lights, convinced they had finally spotted a UFO.
While most UFO sightings are eventually attributed to weather balloons or military aircraft, a small percentage of cases remain unexplained by conventional atmospheric science.
Abbreviations.
Usually pronounced as individual letters (U-F-O). Takes the article 'a' rather than 'an' because the first letter is pronounced with a consonant 'y' sound.
an UFOa UFOAlthough it starts with a vowel letter, UFO is pronounced starting with a 'y' sound (/ˌjuː.efˈoʊ/), so it requires the article 'a'.