May you have peace!
My definition is anything that isn't, well, clean (just what does that mean??). But my definition is irrelevant: it's God's definition that matters and His includes, but is not necessarily limited to that which is not "holy" (i.e., upright and without deceit, guile, hypocrisy, falsity, deception, hate, cunning, and things like that). Very often people get all uptight over what others DO... but with God, it is MUCH more about the MOTIVE... than it is about the act.
I think "false" is the operative word here. That word is not to be confused with the words ignorant or misled, however.
If you mean in general, then, I "associate" with all kinds of folks, including those here - God is not partial and neither am I. If you mean spiritually, I would have to say all kinds of folks, too, as my association here includes a bit of both, and I spiritually associate outside of this place, as well.
If you mean what "church" or "religion" do I belong to, I would have to say none, at least not in the manner that I think you mean. I AM the "church"... the "congregation"... as are ALL those of the body of Christ. We, together, make up the "congregation" of the Firstborn. We are "living stones" in the "house" that Christ is building and which God occupies... by spirit. Christ is the foundation, the apostles the foundation cornerstone, the Prophets and others pillars... and we, stone. I "associate," therefore, with those of these whom I have come to know, either directly or indirectly, on occasion in flesh as well as in spirit. We do not "gather" in buildings made with hands, per se, for God does not dwell in handmade buildings. He dwells in us. We are His "temple."
We, do, however, visit each other in our homes from time to time (usually, a couple times a year, for those who can make the effort - some can't/don't for various and understandable reasons); more often than not, however, we "speak" by phone, email, snail mail, etc. (we don't all live in close proximity to one another). Whether we are together in the flesh... or in spirit... however, is irrelevant. Wherever two or more of us ARE gatherered, our Lord is there also (and yes, his presence is manifest, although not visible).
These days, we live in an environment where we don't necessarily have to literally "gather" in the flesh. Due to modern technology, we can "gather" by other means... and we do so, when we can. This is actually wonderful, because we don't have to wait for anyone to arrive personally, or communicate with us by letter. We can talk to, encourage and lift up one another at almost any time of any day, praise Jah!
I hope that answered your question, dear Yadda, and the greatest of love and peace to you!
Your servant and a slave of Christ,
SA