Recorded since c.1378, from Old French -, from Medieval Latin collaterālis, from Latin col- (a form of con-) + the stem of latus.

• IPA: /kəˈlætəɹəl/

collateral (not comparable)

1. Parallel, along the same vein, side by side.
2. Corresponding; accompanying, concomitant.
   • 1814, William Wordsworth, The Excursion:

     Yet the attempt may give / Collateral interest to this homely tale.

3. Being aside from the main subject, target, or goal.

   Synonyms: tangential, subordinate, ancillary

   collateral damage

   Although not a direct cause, the border skirmish was certainly a collateral incitement for the war.

   • 1878, Thomas Babington Macaulay, “[https://en.wikisource.org/wiki/Encyclop%C3%A6dia_Britannica,_Ninth_Edition/Francis_Atterbury Francis Atterbury]”, in Encyclopædia Britannica, Ninth Edition‎^{[https://en.wikisource.org/wiki/Encyclop%C3%A6dia_Britannica,_Ninth_Edition]}:

     That he [Atterbury] was altogether in the wrong on the main question, and on all the collateral questions springing out of it, […] is true.

4. (genealogy) Of an indirect ancestral relationship, as opposed to lineal descendency.

   a collateral descendant

   Uncles, aunts, cousins, nephews and nieces are collateral relatives.

   • 1885, Richard Francis Burton, The Book of the Thousand Nights and a Night, volume 5:

     The pure blood all descends from five collateral lines called Al-Khamsah (the Cinque).

5. (finance) Relating to a collateral in the sense of an obligation or security.
6. (finance) Expensive to the extent of being paid through a loan.
7. Coming or directed along the side.

   collateral pressure

   • c. 1604–1605 (date written), William Shakespeare, “All's Well, that Ends Well”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act I, scene i]:

     collateral light

8. Acting in an indirect way.
   • c. 1603–1606, William Shakespeare, “The Tragedie of King Lear”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act IV, scene v]:

     If by direct or by collateral hand
     They find us touched, we will our kingdom give […]
     To you in satisfaction.

9. (biology, of a vascular bundle) Having the phloem and xylem adjacent.

• lateral

• French: collatéral
• German: nebeneinanderliegend, benachbart
• Portuguese: colateral
• Russian: боково́й

• German: Neben-, Bei-, begleitend, Begleit-
• Portuguese: colateral
• Russian: сопу́тствующий

• French: collatéral
• German: hinzukommend, Bei-
• Portuguese: colateral
• Russian: побо́чный

• French: collatéral
• German: entfernt, weitläufig
• Portuguese: colateral
• Russian: боково́й

• French: collatéral

• French: indirect

collateral

1. (finance) A security or guarantee (usually an asset) pledged for the repayment of a loan if one cannot procure enough funds to repay.

   Synonyms: collateral security, pledge

2. (now rare, genealogy) A collateral (not linear) family member.
3. (anatomy) A branch of a bodily part or system of organs.

   Besides the arteries blood streams through numerous veins we call collaterals.

4. (marketing) Printed materials or content of electronic media used to enhance sales of products (short form of collateral material).
5. (anatomy) A thinner blood vessel providing an alternate route to blood flow in case the main vessel becomes occluded.
6. (archaic) A contemporary or rival.

• lateral

• French: nantissement, gage
• German: Sicherheit, Pfand
• Portuguese: garantia
• Russian: поручи́тельство
• Spanish: prenda

• French: collatéral
• German: entfernter Verwandter, entfernte Verwandte, weitläufige Verwandtschaft
• Portuguese: colateral
• Russian: дальний родственник

• German: Werbematerial, Marketing-Material, Begleitmaterial

• French: collatérale
• German: Umgehungsgefäß, Kollateralgefäß, Kollaterale, Nebengefäß
• Portuguese: colateral
• Spanish: colateral