Aware of and responsive to something; adjusted to match or work well with something else.
From 'attune' (prefix 'at-' + Old French 'tune'), originally a musical term meaning to tune in harmony. By the 1600s, it gained the figurative sense of being 'in harmony' with ideas or emotions.
The word literally comes from music—when two instruments are 'attuned' they vibrate at harmonious frequencies, and by metaphor, people become attuned to ideas by frequency of exposure and attention.
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