This is the 8291st most frequent Turkish word.
muhalefetteki
"Belonging to or in the opposition."
Here, "muhalefetteki" is an adjective describing "parti" (party) from the opposition.
Muhalefetteki parti yeni bir yasa tasarısı önerdi.
The opposition party proposed a new bill.
In this sentence, "muhalefetteki" qualifies "lider" (leader), indicating the leader belonging to the opposition.
Muhalefetteki lider halkı büyük bir mitinge çağırdı.
The opposition leader called the people to a large rally.
Here, "muhalefetteki" works as a descriptor for "görüşlerin" (views), referring to views held by members of the opposition.