Compass 可解作指南針，又可解作圓規，有冇得解釋?

是有得解釋，是要看它的歷史：以下就是它的字源解釋


compass
圖片參考：http://www.etymonline.com/graphics/dictionary.gif

c.1300, "space, area, extent," from O.Fr. compas, from compasser "to go around, measure, divide equally," from V.L. *compassare "to pace out," from L. com- "together" + passus "a step." The mathematical instrument so called from 1387. The mariners' directional tool (so called since early 15c.) took the name, perhaps, because it's round and has a point like the mathematical instrument. The word is in most European languages, with a mathematical sense in Romance, a nautical sense in Gmc., and both in Eng.
O.Fr是Old French
V.L.是Vulgar Latin
L是Latin
Gmc是Gmc. Germanic, a branch of Indo-European, ancestral language of English, German, Dutch, Frisian, Scandinavian tongues and several extinct languages such as Gothic and Frankish.
希望幫到你！

人生不必樣樣都要解的!
英文, 甚至文中, 都有很多同字不同解的, compass 只是其一而已!
e.g. tear, minute, saw, beat, fan, will, earth, mercury, found, mount, plant.....etc., 一於不用理!