/əˈdɛndə/, addendums, (rare) addendas.addendumn.
/əˈdɛndəm/, U.S. /əˈdɛndəm//əˈdɛndə/, addendums, (rare) addendas. 1. A thing that is added, typically in order to correct, clarify, or supplement something, esp. an item added at the end of a book, an appendix. Also: an additional clause amending an agreement, a resolution, etc. Chiefly in plural (frequently with singular agreement). Cf. corrigendum n.
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society > communication > book > matter of book > [noun] > appendix or supplement
supplement1523
appendix1549
appendant1570
appendage1651
addendum1664
Paralipomenon1666
annexture1756
excursus1803
1664 J. Worthington in J. Mede Wks. Gen. Pref. sig. *** His Addenda for the farther clearing or confirming of some passages in this Treatise were such as these. 1. He would have added a Paraphrastical Exposition, [etc.].
1688 R. Holme Acad. Armory ii. xix. 468 I perceived I had omitted [some bearings] in the former Chapters, and..I have in this plate, set them in orderly in classes by themselves, which you may please to add to those of the like nature in the former Chapters, as an addenda to them.
1701 W. Kennett Occas. Let. Eng. Convocations 12 I found..the Addenda so qualifying and so revoking many Words and Thoughts that went before; that I could have no kinder Notion of it [sc. a book], than as a most disjointed and imperfect Piece.
1717 D. Defoe Mem. Church of Scotl. ii. 159 Because some may think the reciting this Story..too long an Interruption to the Thread of Story,..I have placed it..by way of addenda to, and at the End of this second Part of the Work, where it may be read by it self.
1794 R. Burns Let. 19 Oct. (1985) II. 318 You cannot, in my opinion, dispense with a bass to your addenda airs.
1840 W. Berry Encycl. Heraldica IV. Pref. The following Addenda has therefore been arranged in the same manner.
1889 Pall Mall Gaz. 25 Mar. 2/3 The palpable unfrankness of the addendum.
1936 S.P.E. Tract (Soc. for Pure Eng.) No. XLV. 192 A catalogue..by one of the leading American university presses, mentions, as one of the merits of a certain book, that it contains an invaluable addenda.
1973 H. S. Thompson Let. 19 Oct. in Fear & Loathing in Amer. (2000) 551 I've spoken with..Edwards about arranging some kind of ‘buy-out’ addendum to our land contract.
1984 Mech. Engin. 106 89/1 This addenda consists of 49 independent revisions.
1999 Vanity Fair (N.Y.) June 217/2 The episode prompted a flurry of reports, addenda, clarifications, and counterclarifications.
2. Mechanics. The distance by which a tooth of a gearwheel projects beyond the pitch circle; the part of a tooth of a gearwheel lying outside this circle. Contrasted with dedendum n.
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society > occupation and work > equipment > machine > parts of machines > wheel > [noun] > cog or gear > dimensions of cog or gear
addendum1841
module1909
1841 R. Willis Princ. Mechanism 98 Now this addition to the radius of the pitch circle is called by clock-makers the addendum, which term I shall, for convenience, employ.
1881 F. J. Britten Watch & Clockmakers' Handbk. (ed. 4) 21 The pinion..must have the epicycloidal addendum to ensure proper action.
1951 F. Whiteley Gear Manuf: Bk. 4 i. 8 For all ratios other than 1000 the addendum of the pinion is increased and the wheel addendum decreased by the same amount.
2008 Engin. Fracture Mech. 75 4432 Damage due to fatigue contact in gear teeth usually occurs in one of three areas; along the pitch-line, in the addendum..and in the dedendum.
This entry has been updated (OED Third Edition, November 2010; most recently modified version published online December 2021).
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