always (adv.)

mid-14c., contraction of Old English phrase ealne weg "all the time; quite, perpetually," literally "all the way," with accusative of space or distance, though the oldest recorded usages refer to time; see all + way (n.). The adverbial genitive -s appeared early 13c., was rare before c. 1400, but is now standard, though the variant alway survived into 1800s. Meaning "every time" is from early 13c.

Definitions of always

always (adv.)
at all times; all the time and on every occasion;
there is always some pollution in the air
always arrives on time
I will always be there to help you
Synonyms: ever / e'er
always (adv.)
without variation or change, in every case;
he always arrives on time
Synonyms: constantly / invariably
always (adv.)
without interruption;
Synonyms: constantly / forever / perpetually / incessantly
always (adv.)
at any time or in any event;
you can always resign if you don't like it
you could always take a day off
always (adv.)
forever; throughout all time;
we will always be friends
I shall treasure it always
I will always love you