relative density

But relative to centuries past, America is a marvel of domestic tranquility.
No Gods, No Cops, No Masters|James Poulos|January 1, 2015|DAILY BEAST
Parents who want to transfer custody of a child to someone other than a relative must seek permission from a judge.
Judge: Rehoming Kids Is Trafficking|Tina Traster|December 30, 2014|DAILY BEAST
While traveling this holiday season, a relative and I were pulled over by a police officer.
Obama Is Right on Race. The Media Is Wrong.|Keli Goff|December 29, 2014|DAILY BEAST
Of course, this is The Comeback, and so "success" is a relative word.
‘The Comeback’ Finale: Give Lisa Kudrow All of the Awards|Kevin Fallon|December 29, 2014|DAILY BEAST

Not long after I was finally diagnosed, my doctor ordered a bone density scan.
You’re Never ‘Cured’ of an Eating Disorder|Carrie Arnold|December 20, 2014|DAILY BEAST
But I suppose, as he is my nearest relative, it is but natural he should be anxious about my health.
The Pit Town Coronet, Volume I (of 3)|Charles James Wills
This had been quite genuine, for the Professor had been fond of his relative, who had always been very good to him.
Uncanny Tales|Various
The relative quantity of labor embodied in each object is the basis of its value.
The Unsolved Riddle of Social Justice|Stephen Leacock
It is evident that an absolute increase of any variety may be accompanied by a relative decrease.
A Manual of Clinical Diagnosis|James Campbell Todd
An increase in actual number is an absolute increase; an increase in percentage only, a relative increase.
A Manual of Clinical Diagnosis|James Campbell Todd

British Dictionary definitions for relative density

relative density

noun

the ratio of the density of a substance to the density of a standard substance under specified conditions. For liquids and solids the standard is usually water at 4°C or some other specified temperature. For gases the standard is often air or hydrogen at the same temperature and pressure as the substanceSymbol: d See also specific gravity, vapour density

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for relative density

relative density

The ratio of the density of one substance to that of a reference substance, typically water. See more at specific gravity.