nerdom

Etymology

 * attested in the USA from 1983. Note that is used both in the sense of “domain” (nerds, as a group) and in the sense of “characteristics” (being a nerd, nerdiness).

Noun

 * 1)  The attitudes and behaviours of a nerd; nerdiness.
 * 2)  Nerds considered as a group.
 * 3) * 2009, Mark Dalrymple, “Foreword”, in Jack Nutting; Dave Mark; Jeff LaMarche, Learn Cocoa on the Mac (Books for Professionals by Professionals), [New York, N.Y.]:, ISBN 978-1-4302-1859-3 , page xi:
 * I still chuckle at some of [the] jokes that we targeted to very narrow slices of nerdom.
 * 1)  Nerds considered as a group.
 * 2) * 2009, Mark Dalrymple, “Foreword”, in Jack Nutting; Dave Mark; Jeff LaMarche, Learn Cocoa on the Mac (Books for Professionals by Professionals), [New York, N.Y.]:, ISBN 978-1-4302-1859-3 , page xi:
 * I still chuckle at some of [the] jokes that we targeted to very narrow slices of nerdom.

Usage notes
The rough synonym is more common.