Rare a. : Early.

Rare superl. : Nearly raw; partially cooked; not thoroughly cooked; underdone; as, rare beef or mutton.

Rare superl. : Not frequent; seldom met with or occurring; unusual; as, a rare event.

Rare superl. : Of an uncommon nature; unusually excellent; valuable to a degree seldom found.

Rare superl. : Thinly scattered; dispersed.

Rare superl. : Characterized by wide separation of parts; of loose texture; not thick or dense; thin; as, a rare atmosphere at high elevations.

Example:
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Taxonomy
XBLA, games, biscuit, lair, UK game, game developer, Rare Ltd, MGS, Xbox 360, goodness, latest releases, the Piñata, MP3 player, embrace, Company Profile, Trouble in Paradise, Banjo-Kazooie, Nuts & Bolts.

Defination from the web:
Producing computer games since the late 1970s.