die Geschlossenheit
unity
The state of agreement, cohesion, and solidarity within a group or community.
Die Mannschaft demonstrierte ihre Geschlossenheit und gewann das Spiel.
The team demonstrated its unity and won the game.

unity / continuity
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unity
The state of agreement, cohesion, and solidarity within a group or community.
Die Mannschaft demonstrierte ihre Geschlossenheit und gewann das Spiel.
The team demonstrated its unity and won the game.

The word is formed from the adjective 'geschlossen' (closed; past participle of 'schließen' (to close)) with the suffix '-heit' (-ness). The suffix '-heit' turns an adjective into an abstract feminine noun. The basic meaning of 'geschlossen' (complete, as a unit) is recognizable in both meanings.
Wegen des Feiertags sind heute alle Geschäfte geschlossen.
Because of the holiday, all shops are closed today.
The meaning is easy to recognize from context. If the word refers to a group of people (e.g. team, party, family), it means unity. If it refers to a physical surface (e.g. snow cover, clouds), it means an uninterrupted unit.
Die Geschlossenheit der Partei wurde auf die Probe gestellt.
The unity of the party was put to the test.
In a social or political context, 'Geschlossenheit' (unity) is often used with verbs like 'zeigen' (to show), 'demonstrieren' (to demonstrate), or 'bewahren' (to preserve). For example, people speak of the 'Geschlossenheit einer Mannschaft' (unity of a team) or 'politische Geschlossenheit' (political unity).
Der Trainer lobte die Geschlossenheit seines Teams.
The coach praised the unity of his team.
unity / unit
'die Einheit' and 'die Geschlossenheit' can both describe a group standing together and appearing united to the outside. 'Geschlossenheit' especially emphasizes that the group presents a united front and shows no open conflicts. 'Einheit' is a bit more general and can also refer to the state of a whole country or community. In political, professional, or social groups, both can sound possible. 'Geschlossenheit' fits especially well when you want to emphasize the group's united appearance.

Wegen der Geschlossenheit des Teams konnte der Plan schnell umgesetzt werden.
Thanks to the unity of the team, the plan could be implemented quickly.
Die Einheit der Gruppe war nach dem Streit nicht mehr selbstverständlich.
After the argument, the unity of the group could no longer be taken for granted.