The term 'intangible quality' can be described by two crossword solutions: AURA (4 letters) and AIR (3 letters). An AURA is an invisible, intangible quality or atmosphere that surrounds a person or thing. It is often associated with a feeling of mystery or awe. AIR, on the other hand, is a mixture of gases that make up the Earth's atmosphere. It is also an intangible quality, as it cannot be seen or touched. Both of these terms can be used to describe an intangible quality.