This is the 2043rd most frequent Chinese word.
齐
"齐" means "neat, even, uniform, or together."
In this sentence, '齐' is used to describe unity or togetherness, as part of the term '齐心协力', meaning working together.
我们要齐心协力完成这项任务。
We need to work together with one heart and one mind to complete this task.
Here, '齐' conveys the meaning of uniformity or being orderly, seen in '整齐划一' where it describes harmonious arrangement.
他的脚步整齐划一，非常好看。
His steps are uniform and in harmony, very pleasing to watch.
In this usage, '齐' means evenness or uniform growth, describing the balanced distribution of plants.