(geometry, engineering) extended line (usually as an auxiliary line) / extension of a traffic route (e.g. highway or railway line) / (figuratively) extension or result developed from an existing thing

the above / the top (position or direction) / the surface of / superior in skill, age, level, etc.

in addition; furthermore / on top of (which)

straight line

同じ: same; common, similar

two things [small or without a counter category]

imperfective and stem (or continuative) forms of 同じる (dōjiru) [ichidan]: agreeing / imperfective and stem (or continuative) forms of 同ずる (dōzuru) [irregular]: agreeing

same, identical / common, similar

(colloquial) same, identical / (colloquial) common, similar

anyhow, anyway