Meanings

code-sharing (e.g. airlines)

unshared electron pair

public agency

code-share flight

public expenditure

joint manufacturing

to do together

environmentally friendly

co-director

joint unlawful act

to go on a trip with someone

studying together (esp. of males and females)

common humanity

mixed-sex school

point in common

Union of Soviet Socialist Republics

most recent common ancestor

symplesiomorphy

common ancestor

together