halfway
adj. place C1 Advanced Oxford US //ˈhæfˈweɪ// UK //hˈɑːfweɪ// half·way
adj. at the middle point between two places or times. You use it when you have finished half of a journey or a task.
adj. at or to a point equidistant between two limits; in the middle of a journey, process, or period of time.
We stopped halfway to have a rest.
The hikers realized they were only halfway to the summit when the sun began to set.
The project was abandoned halfway through the fiscal year because the initial funding proved insufficient to cover the rising costs of raw materials.
Usage
Commonly functions as a prepositional-like adverb followed by 'through' or 'between'.
Pitfall
I am halfway of the bookI am halfway through the bookWhen describing progress through a task or object, 'halfway' requires the preposition 'through' rather than 'of'.