change+reciprocally
51alternate — al·ter·nate 1 / ȯl tər nət, al / adj 1: occurring or succeeding by turns 2: being an alternative alternate juror alternate 2 n 1 …
52Philosophiæ Naturalis Principia Mathematica —   Title page of Principia , first edition (1687) Original title …
53Madonna (entertainer) — Madonna …
54History of American newspapers — The history of American newspapers goes back to the 17th century with the publication of the first colonial newspapers.Colonial period(This section is based on [http://www.bartleby.com/225/index.html#7 The Cambridge History of English and… …
55Differences between Spanish and Portuguese — Although Portuguese and Spanish are closely related, to the point of having a considerable degree of mutual intelligibility, there are also important differences between them, which can pose difficulties for people acquainted with one of the… …
56commute — /keuh myooht /, v., commuted, commuting, n. v.t. 1. to change (a prison sentence or other penalty) to a less severe one: The death sentence was commuted to life imprisonment. 2. to exchange for another or for something else; give and take… …
57dietary law — Judaism. law dealing with foods permitted to be eaten, food preparation and combinations, and the utensils and dishes coming into contact with food. Cf. kashruth. [1925 30] * * * ▪ religion Introduction any of the prescriptions as to what… …
58respiration, human — ▪ physiology Introduction the process by which oxygen is taken up and carbon dioxide discharged. The design of the respiratory system The human gas exchanging organ, the lung, is located in the thorax, where its delicate tissues are… …
59Ocean acoustic tomography — The western North Atlantic showing the locations of two experiments that employed ocean acoustic tomography. AMODE, the Acoustic Mid Ocean Dynamics Experiment (1990 1), was designed to study ocean dynamics in an area away from the Gulf Stream,… …
60optics — /op tiks/, n. (used with a sing. v.) the branch of physical science that deals with the properties and phenomena of both visible and invisible light and with vision. [1605 15; < ML optica < Gk optiká, n. use of neut. pl. of OPTIKÓS; see OPTIC,… …
