Definify.com
Webster 1913 Edition
Momentarily
Mo′men-ta-ri-ly
,adv.
 1. 
Every moment; from moment to moment. 
Shenstone.
 Webster 1828 Edition
Momentarily
MO'MENTARILY
,adv.
  Definition 2025
momentarily
momentarily
English
Adverb
momentarily (not comparable)
- In a momentary manner; for a moment or instant.
 -  (US, proscribed) In a moment or very soon; at any moment.
- This plane will be landing at Idlewild Airport momentarily.
 
 - Progressively; moment by moment.
 
Usage notes
Many speakers object to the use of momentarily in the sense of “in a moment” rather than “for a moment”, since this is inconsistent with the meaning of momentary;[1][2] nonetheless, this use is quite common in North America, and is particularly associated with airlines, such as “we will be landing momentarily”.[3][1][2] In place of momentarily, many speakers prefer the terms presently, soon[1][2] or the phrase “in a moment”,[2] for this sense of “in a moment”.
Synonyms
- (in a moment): presently, shortly, soon
 - (for a moment): briefly
 - (moment by moment): progressively
 
Translations
In a momentary manner
In a moment or very soon
progressively; moment by moment
References
- 1 2 3 “Just a Moment”, by William Safire, New York Times, May 11, 1997
 - 1 2 3 4 I Stand Corrected: More on Language, by William Safire pp. 137–138
 - ↑ On language, by William Safire, 1980, p. 9