1 tr. be a sign or indication of (a yawn signifies boredom).
2 tr. mean; have as its meaning ('Dr' signifies 'doctor').
3 tr. communicate; make known (signified their agreement).
4 intr. be of importance; matter (it signifies little).
Derivatives:
signifier n.
Etymology: ME f. OF signifier f. L significare (as SIGN)
Useful english dictionary. 2012.