how long something has existed

state of being mature; full development

having reached full natural growth or development

not having reached maturity

not having reached maturity

born after a gestation period of less than the normal time

(used of living things especially persons) in an early period of life or development or growth

how long something has existed

state of being mature; full development

in the state of development between puberty and maturity

of an organism prior to birth or hatching

initial

immature of its kind; especially being or characteristic of immature insects in the newly hatched wormlike feeding stage

(especially of human beings) at the age immediately before puberty; often marked by accelerated growth