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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a gadget; dingus; thingumbob. |
International System of Units n.
Abbr. SI
A complete, coherent system of units used for scientific work, in which the fundamental quantities are length, time, electric current, temperature, mass, luminous intensity, and amount of substance. Also called International System.