Inclination; slope; tilt — the slant or steepness of a surface or the act of tilting (can also be used as an intransitive verb).
この坂は傾斜がきつく、自転車では登りにくい。
This slope is steep and hard to climb by bicycle.
グラフの傾斜から売上の増加率が分かる。
You can tell the sales growth rate from the slope of the graph.
地盤が傾斜しているため、建物の基礎を補強した。
Because the ground was slanted, the building's foundation was reinforced.