Meaning of DOT in English

[noun] [C] - a very small round markThe full stop at the end of this sentence is a dot.Her skirt was blue with white dots.The stars just look like thousands of tiny dots of light.By the time I turned round to wave, Mum and Dad were two dots on the horizon.Dots are also the short sounds or flashes of light used with dashes (= longer sounds or flashes) when sending messages in Morse (code).If someone or something arrives on the dot, they arrive or happen at exactly the stated or expected time.The plane landed on the dot (of two o'clock).(UK and ANZ informal dated) My ancestors left Spain generations ago, back in the year dot (= a very long time ago).(specialized) A dot-matrix printer is a computer printer that forms letters, numbers and other symbols from dots.

Cambridge English vocab.      Кембриджский английский словарь.