either
🇺🇸
/ˈiːðər/
🇬🇧
/ˈaɪðə(r)/
one of two choices, both are okay
You can choose either book to read.
both of two things
There were trees on either side of the road.
also, in the same way (used with 'not')
I don't like coffee, and I don't like tea either.
shows a choice between two options
You can either stay home or come with us.
adds more information to what was said
The food was good, and it wasn't expensive either.