You Do Need power plug adapter while traveling from Lebanon to Dominican Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Dominican Republic are A, B and C and in Lebanon are C, D and G. This is how they look like.

Lebanon

In Lebanon, outlets of type C, D and G are in use.

Type C

Type D

Type G

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C