Intermittently means stopping and starting at irregular intervals. Rain fell intermittently, works intermittently, intermittently available.
The irregularity is the point, since something happening intermittently cannot be predicted, which is what separates it from periodically. An intermittent fault is the hardest kind to trace, because it will not appear when watched.
1adverbintermittentlyStopping and starting at irregular intervals.
“It rained intermittently throughout the day, so we never put our umbrellas away.”
intermittently is a manner.
Latin
intermittens — sending between
Middle French
intermittent
English
intermittent
English, today
intermittently
Built from
From intermittent + -ly. intermittent comes from Middle French intermittent, from Latin intermittens (“sending between”), from prefix inter- (“among, on”) + mittens (“sending”), from mittere (“to send”).
Etymology from Wiktionary, CC BY-SA