A group of eight people or things. The octet of musicians performed a beautiful symphony together.
A musical composition for eight voices or instruments. The composer wrote an octet that was performed by a string ensemble.
A set of eight lines of verse, especially the first eight lines of a sonnet in the Italian form. The poet crafted an octet that set the tone for the rest of the sonnet.
In computing, a byte, which consists of eight bits. Each octet in the data packet was carefully analyzed for errors.
In chemistry, a stable group of eight electrons occupying a valence shell. According to the octet rule, atoms tend to gain or lose electrons to complete an octet.