a. [ L. centesimus the hundredth, fr. centum a hundred: cf. F. centésimal. ] Hundredth. -- n. A hundredth part. [ 1913 Webster ]

The neglect of a few centesimals. Arbuthnot. [ 1913 Webster ]

a. [ Cf. F. infinitésimal, fr. infinitésime infinitely small, fr. L. infinitus. See Infinite, a. ] Infinitely or indefinitely small; less than any assignable quantity or value; very small. [ 1913 Webster ]

Infinitesimal calculus, the different and the integral calculus, when developed according to the method used by Leibnitz, who regarded the increments given to variables as infinitesimal. [ 1913 Webster ]

n. (Math.) An infinitely small quantity; that which is less than any assignable quantity. [ 1913 Webster ]

adv. By infinitesimals; in infinitely small quantities; in an infinitesimal degree. [ 1913 Webster ]

a. [ L. millesimus, fr. mille a thousand. ] Thousandth; consisting of thousandth parts; as, millesimal fractions. [ 1913 Webster ]

a. [ L. nonagesimus the ninetieth. See Nonagenarian. ] (Astron.) Of or pertaining to the ninetieth degree or to a nonagesimal. [ 1913 Webster ]

n. (Astron.) The middle or highest point of the part of the ecliptic which is at any given moment above the horizon. It is the ninetieth degree of the ecliptic, reckoned from the points in which it is intersected by the horizon. [ 1913 Webster ]

adj. Least favorable for survival; -- of an organism's environment.
Syn. -- pessimum(prenominal). [ WordNet 1.5 ]

a. [ Cf. F. quadragésimal. ] Belonging to Lent; used in Lent; Lenten. [ 1913 Webster ]

n. pl. Offerings formerly made to the mother church of a diocese on Mid-Lent Sunday. [ 1913 Webster ]

a. Consisting of seventy days, years, etc.; reckoned by seventies. [ 1913 Webster ]

Our abridged and septuagesimal age. Sir T. Browne. [ 1913 Webster ]

a. [ Cf. F. sexagésimal. ] Pertaining to, or founded on, the number sixty. [ 1913 Webster ]

Sexagesimal fractions or
Sexagesimal numbers (Arith. & Alg.), those fractions whose denominators are some power of sixty; as, 1/60, 1/3600, 1/216000; -- called also astronomical fractions, because formerly there were no others used in astronomical calculations. --
Sexagesimal arithmetic, or
Sexagenary arithmetic, the method of computing by the sexagenary scale, or by sixties. --
Sexagesimal scale (Math.), the sexagenary scale. [ 1913 Webster ]

n. A sexagesimal fraction. [ 1913 Webster ]

a. [ L. vigesimus twentieth, from viginti twenty. ] Twentieth; divided into, or consisting of, twenties or twenty parts. Tylor. [ 1913 Webster ]