scholarship; learning; knowledge

mineral oil

(geology) serpentinite

leaf, needle, blade (of a plant) / a season, an age: a shorter period of time within a longer one / an administration: the period of time during which a certain person holds a certain office

(rare) counter for flat, thin things such as leaves or paper / (by extension) counter for small boats

leaf

call back, recall

a stone / (slang, electronics) a transistor

for grains of rice; one koku is equal to approximately 180 litres / (by extension, historical) for land of famous daimyo or samurai; one koku is also approximately 180 litres

counter for gemstones used as bearings in watches and other devices / (slang, electronics) counter for transistors, especially discrete ones