Definition of "centrally"

The tubes being filled with distilled water, the light from an electric lamp was directed toward the central glass of the refractometer and the latter adjusted by screws till the light passed centrally down both tubes, and then the right angled prism at the further end adjusted till the light returned and was reflected into the telescope, where generally two images were observed.

1886, Albert A. Michelson, Edward W. Morley, “Influence of Motion of the Medium on the Velocity of Light”, in American Journal of Science, Series 3, Volume 31, Number 185, pages 377-386

Hence for the rain to centrally traverse the tube, this must be inclined at an angle BAD to the vertical;

1911, “Aberration”, in Encyclopædia Britannica Eleventh Edition

The labium is prolonged centrally into a “tongue,” which is glandular at the tip; the paraglossae are linear.

1911, “Encyclopædia Britannica Eleventh Edition”, in Wasp

Hungary has made the transition from a centrally planned to a market economy, with a per capita income one-half that of the Big Four European nations.

2004, Central Intelligence Agency, “Hungary”, in The World Factbook