What is Exact match domain?

A domain name that exactly matches a target keyword. The leaked documents note minor penalties for these, though the host says they can still help if backed by strong content.

From Unpacking the Google Data Leak: Fact or Fiction?

A domain name that exactly matches a target keyword, described in the episode as an SEO spam technique of yesteryear, though Google still considers the URL a significant ranking factor.

From Optimization Under the Hood - #SEOpodcast 267

A domain name that exactly matches a target keyword phrase, such as carbonfiberhoods.com, which can be a ranking factor but requires good content and products to avoid negative effects.

From Different Ways Social Factors Can Affect Your Site's SEO - #seopodcast 173

A domain name built entirely from a target keyword, such as poolmaintenancehouston.com. Google has an algorithm update that devalues these domains for appearing spammy.

From 8 SEO Practices That Are No Longer Effective by Rand Fishkin #322

A domain name that exactly matches a target keyword phrase, such as SEOHouston.com, which the hosts say only carries value if that phrase is the actual company name.

From Adding Detail and Expanding on Content - Internet Marketing Podcast Number 197

A domain name that matches a target keyword exactly, which the hosts note can help or harm search engine rankings depending on how it is used.

From 2012 SEO Year in Review - Part 2 - #seopodcast 175

A domain name that exactly matches a keyword search phrase, such as Houstonplumber.com; Google is devaluing these so they no longer rank on page one by domain name alone.

From International Internet Marketing and Panda Update - #seopodcast 110