Definition from Wiktionary, the free dictionary
Alternative forms 
- (RP) enPR: 'stōn āj", IPA: /ˈstəʊn ˌeɪdʒ/, X-SAMPA: /"st@Un %eIdZ/
- (US) enPR: 'stōn āj", IPA: /ˈstoʊn ˌeɪdʒ/, X-SAMPA: /"stoUn %eIdZ/
Proper noun 
- (archaeology) A broad prehistoric period during which humans widely used stone for toolmaking.
- (figuratively, informal) Any extremely primitive or undeveloped era.
- (figuratively) The time a particular field was introduced and was in its earliest stages of development.
- (archaeology): Lithic
Coordinate terms 
See also 
informal: any extremely primitive or undeveloped era
figuratively: the time a particular field was introduced
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