observance

Solemnisation is likely misspelled.

Solemnisation has no English definition.

As a noun observance

is the practice of complying with a law, custom, command or rule.

Formality is a related term of observance.

As nouns the difference between formality and observance

is that formality is (uncountable) the state of being formal while observance is the practice of complying with a law, custom, command or rule.

Notice is a related term of observance.

As nouns the difference between notice and observance

is that notice is the act of observing; perception while observance is the practice of complying with a law, custom, command or rule.

As a verb notice

is to observe or take notice of.

Accord is a related term of observance.

As nouns the difference between accord and observance

is that accord is agreement or concurrence of opinion, will, or action while observance is the practice of complying with a law, custom, command or rule.

As a verb accord

is (lb) to make to agree or correspond; to suit one thing to another; to adjust.

Sacrament is a related term of observance.

As nouns the difference between sacrament and observance

is that sacrament is (islam) the rites in the five pillars of islam while observance is the practice of complying with a law, custom, command or rule.

Observance is a related term of assent.

As nouns the difference between observance and assent

is that observance is the practice of complying with a law, custom, command or rule while assent is agreement, act of agreeing.

As a verb assent is

to agree to, give approval.

Shivoo is a related term of observance.

As a noun observance is

the practice of complying with a law, custom, command or rule.

Consideration is a related term of observance.

As nouns the difference between consideration and observance

is that consideration is consideration (the process of considering) while observance is the practice of complying with a law, custom, command or rule.

Party is a related term of observance.

As nouns the difference between party and observance

is that party is party (social gathering for fun) while observance is the practice of complying with a law, custom, command or rule.

Observance is a related term of likeness.

As nouns the difference between observance and likeness

is that observance is the practice of complying with a law, custom, command or rule while likeness is the state or quality of being like or alike; similitude; resemblance; similarity.

As a verb likeness is

(archaic|transitive) to depict.