Line, Queue, Matrix
noun
You know the two words that make up this word, 行 and 列, and they both have similar meanings: a line and a row. Put them together and you have a line or a queue. This usually means a line of people waiting for their turn, for example to enter a restaurant. It can be also used for a line that marches, like a line in a parade. In a mathematics context, it can refer to a matrix, which makes sense because they're lines and rows of numbers and stuff.
ぎょうれつ
This word takes the readings of the two words that make it up, so you should be lining up to read it!
行列のできるラーメン屋を見つけた。
I found a ramen restaurant that has a line.
あ、アリの行列だ！
Oh, a line of ants!
コンサートのチケットを買うために、夜中から行列にならびました。
I lined up in a queue at midnight to buy concert tickets.
今日は数学のクラスで行列について学びました。
I learned about matrices today in math class.