over

As a preposition of special relationships, over indicates movement above or across time or place. It can also indicate position or transition.

Examples:

• I’ll work over the weekend to finish the project.
• We hope not to go over budget this year.
• The board has control over the bylaws of the organization.
• Boston has changed over the last few years.
• The bridge will span over the river.
• The new highway will cross over 7 states – nearly 17,000 miles.
• The cross country team ran over 500 km in preparation for this weekend’s meet.

It is not to be confused with more than, an adverbial phrase.