free float

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free float

[¦frē ′flōt]
(industrial engineering)
The length of time, expressed as work units, that a specific activity may be delayed without delaying the start of another activity scheduled to follow immediately after. Also known as free slack.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

free float

In CPM terminology, the amount of extra time available for an activity if every activity in the project starts as early as possible; the amount of float that can be allocated to an activity without interfering with subsequent work.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.