To Meet, To Encounter
intransitive verb, godan verb
This word consists of kanji with hiragana attached. Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means meet so the verb form of that is to meet or to encounter.
あう
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you: You have to remember the あ part but let's include the う as well for this one. Who do you want to meet more than anyone? Think about it. Then, imagine meeting them. The first thing they do is grab your arm and pinch it. You yell out "OW!" (あう) and they laugh and run away.
アメリカで母に会う。
I'm meeting my mother in the United States.
兄とは大体、月に一回会います。
I usually meet my older brother once a month.
トーフグのコウイチに生で会ったことある?
Have you ever met Koichi from Tofugu in-person?