1. Relying on observation or experiment
   - experimental, data-based

See also: empiric, empirical

• rateables
• ratel
• ratepayer
• rater
• rates
• rathe
• rather
• rathole
• rathskeller
• Ratibida
• Ratibida columnaris
• Ratibida columnifera
• Ratibida tagetes
• ratification
• ratified
• ratifier
• ratify
• rating
• rating system
• ratio
• ratiocinate
• ratiocination
• ratiocinative
• ratiocinator
• ration