This is the 971st most frequent Ukrainian word.
спільний
Shared; common; joint.
In this sentence, 'спільний' describes an interest that is shared or held in common by multiple parties.
Ми маємо спільний інтерес у цьому проекті.
We have a common interest in this project.
Here, 'спільний' characterizes an event that is jointly arranged or participated in.
Вони організували спільний вечір із друзями.
They organized a joint evening with friends.
In this usage, 'спільний' refers to a task or effort that is undertaken collaboratively by multiple individuals.