The difference between Commonly and Friendly
When used as adverbs, commonly means as a rule, whereas friendly means in a friendly manner, like a friend.
Friendly is also noun with the meaning: a game which is of no consequence in terms of ranking, betting etc.
Friendly is also adjective with the meaning: generally warm, approachable and easy to relate with in character.
check bellow for the other definitions of Commonly and Friendly
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Commonly as an adverb:
as a rule; frequently; usually
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Commonly as an adverb (obsolete):
in common; familiarly
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Friendly as an adjective:
Generally warm, approachable and easy to relate with in character.
Examples:
"Your cat seems very friendly."
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Friendly as an adjective:
Inviting, characteristic of friendliness.
Examples:
"He gave a friendly smile."
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Friendly as an adjective:
Having an easy or accepting relationship with something.
Examples:
"a user-friendly software program"
"a dog-friendly café"
"the use of [[environmentally friendly]] packaging"
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Friendly as an adjective:
Without any hostility.
Examples:
"a friendly competition"
"a friendly power or state"
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Friendly as an adjective:
Promoting the good of any person; favourable; propitious.
Examples:
"a friendly breeze or gale"
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Friendly as an adjective (military):
Of or pertaining to friendlies (friendly noun sense 2, below). Also applied to other bipolar confrontations, such as team sports
Examples:
"The soldier was killed by friendly fire."
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Friendly as an adjective (number theory):
Being or relating to two or more natural numbers with a common abundancy.
Examples:
"friendly numbers;  friendly pairs;  friendly n-tuples"
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Friendly as an adjective (in compounds):
Not damaging to, or compatible with (the compounded noun)
Examples:
"The cobbled streets aren't very bike-friendly."
"Organic farms only use soil-friendly fertilisers."
"Our sandwiches are made with dolphin-friendly tuna."
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Friendly as an adverb (archaic):
In a friendly manner, like a friend.
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Friendly as a noun (sports):
A game which is of no consequence in terms of ranking, betting etc.
Examples:
"Even as friendlies, derbies often arouse strong emotions"
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Friendly as a noun:
A person or entity on the same side in a conflict.