what is accretion in astronomy
The noun ACCRETION has 6 senses: 1. an increase by natural growth or addition. 2. something contributing to growth or increase. 3. (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases.4. (biology) growth by addition as by the adhesion of parts or particles. 5. (geology) an increase in land resulting from alluvial deposits or waterborne sediment.. something contributing to growth or increase. 3. (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases. 4. (biology) growth by addition as by the adhesion of parts or particles.