[to sth; see also: basic, critical, main, principal, key, important]
The following lemma, crucial to Theorem 2, is also implicit in [4].
The main <crucial/key> ingredient in the proof of...... is......
Go to List of words starting with:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
Y
Z