100 Best Synonyms for “Once”

No.	Item	Definition
1.	a lone time	a single occasion
2.	a single occasion only	one occasion only
3.	a single time	one time only
4.	ages ago	a very long time ago
5.	at a point	at a certain time
6.	at a prior point	at a previous time
7.	at a stage	during a certain period
8.	at a time	during one period
9.	at an earlier point	at a previous time
10.	at one earlier moment	at one prior moment
11.	at one earlier point	at one prior time
12.	at one earlier stage	during one prior period
13.	at one moment	at a certain moment
14.	at one point	at a certain time
15.	at one prior moment	at one earlier moment
16.	at one prior point	at one earlier time
17.	at one prior stage	during one earlier period
18.	at one stage	during one period
19.	at one time	formerly or once
20.	at some earlier point	at some previous time
21.	at some earlier stage	during some previous period
22.	at some point	at an unspecified time
23.	at some prior point	at some previous time
24.	at some prior stage	during some previous period
25.	at some stage	during some period
26.	at some time	at an unspecified time
27.	back then	at that past time
28.	before	at an earlier time
29.	earlier	at a prior time
30.	erstwhile	former; in the past
31.	formerly	at an earlier time
32.	in bygone days	in earlier times
33.	in days gone by	in the past
34.	in earlier days	in former times
35.	in earlier times	formerly
36.	in former times	long ago
37.	in olden days	long ago
38.	in previous times	formerly
39.	in prior times	formerly
40.	in the past	formerly; before now
41.	in time past	formerly
42.	in times past	formerly
43.	long ago	far back in time
44.	on a prior occasion	once before
45.	on an earlier occasion	once before
46.	on one earlier occasion	once before
47.	on one instance	on one occasion
48.	on one prior occasion	once before
49.	on that occasion	at that time
50.	on this occasion	at this time
51.	one bout	one occurrence
52.	one brief instant	one very short instant
53.	one brief moment	one short moment
54.	one brief spell	one short period
55.	one brief time	for one short occasion
56.	one crack	one attempt
57.	one day	at some time
58.	one earlier time	on one prior occasion
59.	one fleeting moment	one very brief moment
60.	one former occasion	one past occasion
61.	one former time	one past occasion
62.	one go	one attempt
63.	one instance	a single occurrence
64.	one instant	one very short moment
65.	one interval	one period
66.	one minute	a short time
67.	one moment	a single moment
68.	one occasion	a single time
69.	one pass	one attempt
70.	one past time	one earlier occasion
71.	one period	one span of time
72.	one previous time	on one earlier occasion
73.	one round	one occurrence
74.	one run	one attempt
75.	one second	a very short time
76.	one session	one period of activity
77.	one short spell	one short period
78.	one short time	for one short period
79.	one shot	one attempt
80.	one sitting	one uninterrupted session
81.	one solitary time	just one occasion
82.	one spell	one period
83.	one stab	one attempt
84.	one stint	one period
85.	one stretch	one continuous period
86.	one time	on one occasion
87.	one try	one attempt
88.	one turn	one occasion
89.	previously	before now
90.	single occasion	one particular time
91.	sometime	at an unspecified past time
92.	that time	on that occasion
93.	the one time	that single occasion
94.	then	at that time
95.	this time	on this occasion
96.	upon a time	at one time
97.	years ago	in past years
98.	years back	many years ago
99.	yonks ago	a very long time ago
100.	yore	time long past