a musician who adapts a composition for particular voices or instruments or for another style of performance
"The concert program listed Jane as the adapter, noting she had skillfully rearranged Bach's cello suites for a string quartet."
One who is capable of adapting to differing situations.
"The new team leader proved herself a true adapter, seamlessly adjusting her management style whether she was overseeing engineers or marketing staff."
In plain English: An adapter is a small device that lets you plug something into an outlet or port it wasn't originally designed for.
"I need to buy an adapter to plug my phone charger into the European outlet."
Usage: In everyday usage, an adapter is a device that allows two incompatible components to connect, such as a plug converter or software interface. Do not use this term to describe a person's ability to adjust to new situations, which is the literal definition but rarely intended in casual conversation.
The word adapter is formed by adding the suffix -er to the verb adapt. It refers to a person or thing that makes something suitable for use elsewhere, following directly from the meaning of its root word.