for the most part
"he is mainly interested in butterflies"
of primary import
"this is primarily a question of economics"
"it was in the first place a local matter"
Of a primary or central nature, first and foremost
"The company is primarily focused on expanding its online presence rather than opening new physical stores."
In plain English: Primarily means mainly or mostly, showing that something is the most important part of a situation.
"The team primarily focuses on improving their defense this season."
Usage: Use primarily to indicate that something is the main focus or most important part of a situation. Place it before the noun phrase it modifies to clarify that other factors exist but are secondary.
Primarily comes from combining the word primary with the suffix -ly. It entered English to mean "for the most part" or "mainly," extending the original sense of being first in importance.