Longman Dictionary of Contemporary English
WordNet
n. the hemisphere north of the equator
Wikipedia
The Northern Hemisphere of Earth is the half that is north of the equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's North pole.
Due to the Earth's axial tilt, winter in the Northern Hemisphere lasts from the winter solstice (typically December 21 UTC) to the March Equinox (typically March 20 UTC), while summer lasts from the summer solstice (typically June 21 UTC) through to the autumnal equinox (typically September 23 UTC). The dates vary each year due to the difference between the calendar year and the astronomical year.
Usage examples of "northern hemisphere".
And so Paul Bunyon picked him up by the toe and swung his whole bulk around and slammed him into the north pole so hard that that whole northern hemisphere is depressed to this day.
But the next day, by taking the exact hour of the rising and setting of the sun, and by marking its position between this rising and setting, he reckoned to fix the north of the island exactly, for, in consequence of its situation in the Southern Hemisphere, the sun, at the precise moment of its culmination, passed in the north and not in the south, as, in its apparent movement, it seems to do, to those places situated in the Northern Hemisphere.
On his arrival she put him to work with the team designing second- and third-generation plants for the glaciated regions of the northern hemisphere.
The day was fine, such as an October day in the Northern Hemisphere might be.
Tempe had probably escaped the general stripping of the northern hemisphere by being roughly opposite the impact point of the Big Hit, which most areologists now agreed had struck near Hrad Vallis, above Elysium.
The festival of the mid-winter solstice, named after King Arthur, the legendary Sun King, which takes place on or about 21 December in the northern hemisphere.
This is one of the old constellations, situated near Delphinus in the northern hemisphere.
One of the old constellations in the northern hemisphere, near Aquila and Delphinus.
Toward midnight the stars shone out, and if the engineer had been there with his companions he would have remarked that these stars did not belong to the Northern Hemisphere.
Ket Rosteen had stayed in the tower and only the android, the dying poet, Father de Soya, and I were outside now in what seemed to be morning sunlight in an early spring day in the northern hemisphere.
John's-wort (Hypericum majus, Hypericum kalimanum, or any of the 23 other Hypericum species) is common to the Northern Hemisphere.