nucleus, backbone, basic, key

clear, definite, precise

precision, accuracy

(dated) to be seen; to be found / (having seeing ability): able to see (ja: 目が見える、目の見える) / (within sight): visible (ja: 目に見える) / (easily predictable): apparent (ja: 目に見える)

(humble) to meet with someone, to have an audience with someone / to make an appearance, to be present / (possibly archaic) to serve someone, such as a master or husband

(lost seeing ability): blind / (micro): micro / (out of sight): invisible, hidden / (speed): high-speed, rapid / (sense): noise, smell, temperature, energy, health, mentality / (transparent): transparent

extraordinary, unusual

emergency

very; extremely / exceedingly; tremendously

(cytology) a cell