This is the 575th most frequent Hungarian word.
amennyiben
"If" or "in case."
The word 'amennyiben' is used here to indicate a condition.
Amennyiben elég meleget eszel, nem fogsz megfázni.
If you eat warmly enough, you won't catch a cold.
In this instance, 'amennyiben' sets up a hypothetical condition for going hiking.
Amennyiben az időjárás jó lesz, elmegyünk kirándulni.
If the weather is good, we will go hiking.
Here, 'amennyiben' serves to introduce a clause expressing a condition for applying to the job.