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The debut album released by the English rock band Oasis is titled "Definitely Maybe." This album, released in 1994, marked the band's entrance into the music scene and played a significant role in establishing Oasis as one of the most influential bands of the Britpop era. "Definitely Maybe" showcased the band's distinctive guitar-driven sound, catchy melodies, and raw energy, which resonated with a generation of music fans and critics alike.