I'd say it probably depends on who you're communicating with.
For something front-end, as Sumo says, field is probably a good option (especially if it's going to be part of an editable form or similar).
For DB folks, I'd say attribute is your best bet (or column name as above is a more explicit term).
For back-end you'd likely be talking about it in the context of it being a property of the client object.
I'd say it probably depends on who you're communicating with.
For something front-end, as Sumo says, field is probably a good option (especially if it's going to be part of an editable form or similar).
For DB folks, I'd say attribute is your best bet (or column name as above is a more explicit term).
For back-end you'd likely be talking about it in the context of it being a property of the client object.