concern

noun

1
something that interests you because it is important or affects you
the safety of the ship is the captain's concern
2
something or someone that causes anxiety; a source of unhappiness
New York traffic is a constant concern
it's a major worry
3
a feeling of sympathy for someone or something
She felt strong concern for those less fortunate
4
an anxious feeling
care had aged him
they hushed it up out of fear of public reaction
5
a commercial or industrial enterprise and the people who constitute it
he bought his brother's business
a small mom-and-pop business

1
be relevant to
There were lots of questions referring to her talk
My remark pertained to your earlier comments
2
be on the mind of
I worry about the second Germanic consonant shift

Also useful for “concern”:Unscrambler— Rearrange the letters in “concern”