Mountain time 
noun [mass noun]
The standard time in a zone including parts of Canada and the US in or near the Rocky Mountains, specifically:
- (Mountain Standard Time abbreviation MST) Standard time based on the mean solar time at the meridian 105° W., seven hours behind GMT. (Mountain Daylight Time abbreviation MDT) Mountain time during daylight saving, six hours behind GMT..
- The same line separates the Pacific and Mountain time zones - and Arizona doesn't observe Daylight Saving Time.
- This is similar to much of Texas, which should (by longitude) be mostly in the Mountain time zone instead of the Central time zone.
- portership
- porter's knot
- porter's lodge
- porteur
- Porteña
- Porteño
- port face
- portfire
- portfolio
- portfolioed
- portfolio insurance
- portfolio investment
- portfolio stand
- Port-Gentil
- porth
- Port Harcourt
- port haven
- Port Hedland
- porthole
- porthole cist
- portholed
- porthole slab
- porthole stone
- porthole window
- Port Hueneme