Occurrence or existence together or in connection with one another.

Roget 88: accompaniment; adjunct etc. 39; context; appendage, appurtenance.    coexistence, concomitance, company, association, companionship; partnership, copartnership; coefficiency^†.    concomitant, accessory, coefficient; companion, buddy, attendant, fellow, associate, friend, colleague; consort, spouse, mate; partner, co-partner; satellite, hanger on, fellow-traveller, shadow; escort, cortege; attribute.    ... show more

Roget 120: synchronism; coexistence, coincidence; simultaneousness, simultaneity etc. adj.; concurrence, concomitance, unity of time, interim.    [Having equal times] isochronism^†.    contemporary, coetanian^†.    ... show more

Polish: współwystępowanie