名詞 diagonal:

1. (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
2. a line or cut across a fabric that is not at right angles to a side of the fabric
   同義詞：bias
3. an oblique line of squares of the same color on a checkerboard
4. (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
5. a punctuation mark (/) used to separate related items of information
   同義詞：solidus, slash, virgule, stroke, separatrix

形容詞 diagonal:

1. at an angle; especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face
2. having an oblique or slanted direction
   同義詞：aslant, aslope, slanted, slanting, sloped, sloping

1. A chess piece of lowest value that may move forward one square at a time or two squares in the first move, capture other pieces only on a one-space diagonal forward move, and be promoted to any piece other than a king upon reaching the eighth rank.
   兵，小卒價值最小的棋子，一次可向前移一方格或在第一步可移兩格，只能吃對方靠對角線前方的一個子，當?shù)竭_第八級時可升為除王以外的任何一棋子
2. A diagonal mark(/) used especially to separate alternatives, as in and/or, to represent the word per, as in miles/hour, and to indicate the ends of verse lines printed continuously, as in Old King Cole/Was a merry old soul.
   斜線號一種斜線符號，尤用于對選擇加以區(qū)分，如和／或者，表示每 ... 這一詞，如英里／小時，和在詩尾表示連續(xù)打印行，如老國王考勒／是一個快樂的老人
3. A diagonal line or plane.
   對角線或?qū)敲?/div>
4. The wood surface of the furniture is full of diagonal stripes.
   這件家具的木頭表面上布滿了斜紋。

di.ag.o.nal

adj.Abbr. diag.（形容詞）縮寫 diag.
Mathematics
【數(shù)學】
Joining two nonadjacent vertices of a polygon.
對角線的：連接多邊形任意兩個不相鄰頂點的直線的
Joining two vertices of a polyhedron not in the same face.
對頂?shù)模哼B接多面體任意兩個不在同一面上的頂點直線
Having a slanted or oblique direction.
斜的：帶有偏斜的或傾斜方向的
Having oblique lines or markings.
斜紋的：帶有斜線或斜記號的
n.（名詞）
Abbr. diag.Mathematics A diagonal line or plane.
縮寫 diag.【數(shù)學】 對角線或?qū)敲?/br>Something, such as a row, course, or part, that is arranged obliquely.
斜行物：于傾斜位置上的某物，如一行、方向或某部分
A fabric woven with diagonal lines.
斜紋織物：帶斜紋線的纖維編織

來源：
Latin diagôn3lis
拉丁語 diagôn3lis
from Greek diagônios [from angle to angle]
源自 希臘語 diagônios [角對角]
dia- [dia-]
dia- [前綴，表.完全的，有始有終的.]
gônia [angle, corner] * see genu-
gônia [角度，角] *參見 genu-

【引伸】
diag.onally
adv.（副詞）