being of crucial importance; "a pivotal event"; "Its pivotal location has also exposed it to periodic invasions"- Henry Kissinger; "the polar events of this study"; "a polar principal"
the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator; "all of the planets rotate the sun in approximately the same ecliptic"
the middle area of the human torso (usually in front); "young American women believe that a bare midriff is fashionable"
an intermediate part or section; "A whole is that which has beginning, middle, and end"- Aristotle
time between the beginning and the end of a temporal period; "the middle of the war"; "rain during the middle of April"
between an earlier and a later period of time; "in the middle years"; "in his middle thirties"
of a stage in the development of a language or literature between earlier and later stages; "Middle English is the English language from about 1100 to 1500"; "Middle Gaelic"
gathered together or made less diffuse; "their concentrated efforts"; "his concentrated attention"; "concentrated study"; "a narrow thread of concentrated ore"
of or relating to a solution whose dilution has been reduced
intensely focused; "her concentrated passion held them at bay"
an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles; "the equator is the boundary between the northern and southern hemispheres"
a circle dividing a sphere or other surface into two usually equal and symmetrical parts