not least
Adverb
Meaning
not least (not comparable)
Especially; particularly.
His experiences debating made him a more articulate communicator, not least because the topics were often controversial.
For a variety of reasons, not least because it is quite cheap.
Examples
I love my government not least for the extent to which it leaves me alone.
Last, but not least -- in fact, this is most important -- you need a happy ending. However, if you can create tragic situations and jerk a few tears before the happy ending, it will work much better.
It pays to know the enemy - not least because at some time you may have the opportunity to turn him into a friend.
Fear of an enemy can often blind men to other hazards, not least the shape which they themselves make in the world.
Though last, not least in love.
Last, but not least.