What is the unstressed vowel for separate?

The unstressed vowel in "separate" is the schwa sound, represented by the symbol ə.

Here's why:

* Stress: The stress in "separate" falls on the first syllable, "sep".

* Unstressed vowel: The second syllable, "a-rate", is unstressed.

* Schwa: In unstressed syllables, the vowel sound often reduces to the schwa.

Therefore, the "a" in "separate" is pronounced as a schwa.