This is the 14161st most frequent Russian word.
определяющими
"Determining" or "defining."
In this sentence, "определяющими" is used as an adjective describing the factors (факторы) that play a defining role in achieving success.
Факторы, определяющими успех, включают трудолюбие и упорство.
The factors determining success include diligence and persistence.
Here, "определяющими" characterizes the decisions (решения) as pivotal or influencing the outcome of the negotiations.
Решения, принятые вчера, оказались определяющими в ходе переговоров.
The decisions made yesterday turned out to be defining during the negotiations.
In this sentence, "определяющими" explains the moments (моменты) as critical or establishing the project's future path.