This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

preposition. In reference to. See Usage Note at participle.

adj. Causing concern; worrisome.

preposition. Regarding, respecting.

v. Present participle of concern.

preposition. Pertaining to; regarding; having relation to; respecting; as regards.

adj. Important.

n. That in which one is concerned or interested; concern; affair; interest.

n. Importance; moment; consequence.

n. Concern; participation; interposition.

n. Emotion of mind; solicitude; anxiety.

n. An affair of importance; concern; business.

Having interest or moment; important.

Pertaining to; regarding; with relation to; as to; about.

"I'm curious about the title concerning Mar's magnetic field."

regarding    respecting    important    concern    affair    interest    importance    moment    consequence    participation   

concern   

adjourning    burning    churning    discerning    earning    learning    returning    spurning    turning    yearning