1. center, halfway, middle, midway

equally distant from the extremes

• center
• middle
• midway

2. halfway

at a point midway between two extremes

Example Sentences:
'at the halfway mark'

3. halfway

including only half or a portion

Example Sentences:
'halfway measures'

4. halfway, midway

at half the distance; at the middle

Example Sentences:
'he was halfway down the ladder when he fell'

• midway