being up to particular standard or level especially in being up to date in knowledge

being up to particular standard or level especially in being up to date in knowledge

a branch of knowledge

a branch of knowledge

a branch of knowledge

a branch of knowledge

the accumulation of knowledge or skill that results from direct participation in events or activities

the accumulation of knowledge or skill that results from direct participation in events or activities

declare to be true or admit the existence or reality or truth of

declare to be true or admit the existence or reality or truth of