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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. |
"The Hebrews divided the night into three watches, the Greeks usually into four (sometimes five), the Romans (followed by the Jews in New Testament times) into four." [OED]The meaning "small timepiece" is from 1588, developing from that of "a clock to wake up sleepers" (1440). Watchmaker is recorded from 1630; watchtower is attested from 1544.