The persons or number of persons that are present.(noun)
The frequency with which a person is present.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "attendance" in a sentence
"In my (limited) experience, it seems that writing conferences, groups, seminars, etc. always go much better when everyone in attendance is dedicated to writing (and the day)."
"I guess Bo Bo's secret meeting with only Democraps in attendance is his idea of "transparency"."
"Hey look on the bright side I'm sure somebody in attendance is capable of exorcisms."